diff --git a/Week_3/main.py b/Week_3/main.py
index e69de29..3913e21 100644
--- a/Week_3/main.py
+++ b/Week_3/main.py
@@ -0,0 +1,28 @@
+import sys
+from antlr4 import *
+
+from week3Listener import week3Listener
+from week3Lexer import week3Lexer
+from week3Parser import week3Parser
+
+from antlr4.tree.Trees import Trees
+
+def main(argv):
+    if len(argv) == 1 :
+        InputStream = StdinStream()
+    else :
+        inpname = argv[1]
+        InputStream = FileStream(inpname)
+
+    # create lexer, token stream and parser using the selected input
+    lexer = week3Lexer(InputStream)
+    tokstream = CommonTokenStream(lexer)
+    parser = week3Parser(tokstream)
+
+    tree = parser.start()
+
+    print(Trees.toStringTree(tree, None, parser))
+
+if __name__ == '__main__' :
+    main(sys.argv)
+
diff --git a/Week_3/week3.g4 b/Week_3/week3.g4
index 4807632..db14073 100644
--- a/Week_3/week3.g4
+++ b/Week_3/week3.g4
@@ -3,3 +3,4 @@ grammar week3;
 start : 'minimal' ID ;
 ID : [a-zA-Z]+ ;
 WS : [ \t\r\n]+ -> skip ;
+bye : ('bye'| 'goodbye') ID ;
\ No newline at end of file
diff --git a/Week_3/week3.interp b/Week_3/week3.interp
index 5d7edbf..a205391 100644
--- a/Week_3/week3.interp
+++ b/Week_3/week3.interp
@@ -1,18 +1,23 @@
 token literal names:
 null
 'minimal'
+'bye'
+'goodbye'
 null
 null
 
 token symbolic names:
 null
 null
+null
+null
 ID
 WS
 
 rule names:
 start
+bye
 
 
 atn:
-[4, 1, 3, 6, 2, 0, 7, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 4, 0, 2, 1, 0, 0, 0, 2, 3, 5, 1, 0, 0, 3, 4, 5, 2, 0, 0, 4, 1, 1, 0, 0, 0, 0]
\ No newline at end of file
+[4, 1, 5, 11, 2, 0, 7, 0, 2, 1, 7, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 2, 0, 2, 0, 1, 1, 0, 2, 3, 8, 0, 4, 1, 0, 0, 0, 2, 7, 1, 0, 0, 0, 4, 5, 5, 1, 0, 0, 5, 6, 5, 4, 0, 0, 6, 1, 1, 0, 0, 0, 7, 8, 7, 0, 0, 0, 8, 9, 5, 4, 0, 0, 9, 3, 1, 0, 0, 0, 0]
\ No newline at end of file
diff --git a/Week_3/week3.tokens b/Week_3/week3.tokens
index d02f47c..9e492d1 100644
--- a/Week_3/week3.tokens
+++ b/Week_3/week3.tokens
@@ -1,4 +1,8 @@
 T__0=1
-ID=2
-WS=3
+T__1=2
+T__2=3
+ID=4
+WS=5
 'minimal'=1
+'bye'=2
+'goodbye'=3
diff --git a/Week_3/week3Lexer.interp b/Week_3/week3Lexer.interp
index bc0a635..b4d4693 100644
--- a/Week_3/week3Lexer.interp
+++ b/Week_3/week3Lexer.interp
@@ -1,17 +1,23 @@
 token literal names:
 null
 'minimal'
+'bye'
+'goodbye'
 null
 null
 
 token symbolic names:
 null
 null
+null
+null
 ID
 WS
 
 rule names:
 T__0
+T__1
+T__2
 ID
 WS
 
@@ -23,4 +29,4 @@ mode names:
 DEFAULT_MODE
 
 atn:
-[4, 0, 3, 27, 6, -1, 2, 0, 7, 0, 2, 1, 7, 1, 2, 2, 7, 2, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 4, 1, 17, 8, 1, 11, 1, 12, 1, 18, 1, 2, 4, 2, 22, 8, 2, 11, 2, 12, 2, 23, 1, 2, 1, 2, 0, 0, 3, 1, 1, 3, 2, 5, 3, 1, 0, 2, 2, 0, 65, 90, 97, 122, 3, 0, 9, 10, 13, 13, 32, 32, 28, 0, 1, 1, 0, 0, 0, 0, 3, 1, 0, 0, 0, 0, 5, 1, 0, 0, 0, 1, 7, 1, 0, 0, 0, 3, 16, 1, 0, 0, 0, 5, 21, 1, 0, 0, 0, 7, 8, 5, 109, 0, 0, 8, 9, 5, 105, 0, 0, 9, 10, 5, 110, 0, 0, 10, 11, 5, 105, 0, 0, 11, 12, 5, 109, 0, 0, 12, 13, 5, 97, 0, 0, 13, 14, 5, 108, 0, 0, 14, 2, 1, 0, 0, 0, 15, 17, 7, 0, 0, 0, 16, 15, 1, 0, 0, 0, 17, 18, 1, 0, 0, 0, 18, 16, 1, 0, 0, 0, 18, 19, 1, 0, 0, 0, 19, 4, 1, 0, 0, 0, 20, 22, 7, 1, 0, 0, 21, 20, 1, 0, 0, 0, 22, 23, 1, 0, 0, 0, 23, 21, 1, 0, 0, 0, 23, 24, 1, 0, 0, 0, 24, 25, 1, 0, 0, 0, 25, 26, 6, 2, 0, 0, 26, 6, 1, 0, 0, 0, 3, 0, 18, 23, 1, 6, 0, 0]
\ No newline at end of file
+[4, 0, 5, 43, 6, -1, 2, 0, 7, 0, 2, 1, 7, 1, 2, 2, 7, 2, 2, 3, 7, 3, 2, 4, 7, 4, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 3, 4, 3, 33, 8, 3, 11, 3, 12, 3, 34, 1, 4, 4, 4, 38, 8, 4, 11, 4, 12, 4, 39, 1, 4, 1, 4, 0, 0, 5, 1, 1, 3, 2, 5, 3, 7, 4, 9, 5, 1, 0, 2, 2, 0, 65, 90, 97, 122, 3, 0, 9, 10, 13, 13, 32, 32, 44, 0, 1, 1, 0, 0, 0, 0, 3, 1, 0, 0, 0, 0, 5, 1, 0, 0, 0, 0, 7, 1, 0, 0, 0, 0, 9, 1, 0, 0, 0, 1, 11, 1, 0, 0, 0, 3, 19, 1, 0, 0, 0, 5, 23, 1, 0, 0, 0, 7, 32, 1, 0, 0, 0, 9, 37, 1, 0, 0, 0, 11, 12, 5, 109, 0, 0, 12, 13, 5, 105, 0, 0, 13, 14, 5, 110, 0, 0, 14, 15, 5, 105, 0, 0, 15, 16, 5, 109, 0, 0, 16, 17, 5, 97, 0, 0, 17, 18, 5, 108, 0, 0, 18, 2, 1, 0, 0, 0, 19, 20, 5, 98, 0, 0, 20, 21, 5, 121, 0, 0, 21, 22, 5, 101, 0, 0, 22, 4, 1, 0, 0, 0, 23, 24, 5, 103, 0, 0, 24, 25, 5, 111, 0, 0, 25, 26, 5, 111, 0, 0, 26, 27, 5, 100, 0, 0, 27, 28, 5, 98, 0, 0, 28, 29, 5, 121, 0, 0, 29, 30, 5, 101, 0, 0, 30, 6, 1, 0, 0, 0, 31, 33, 7, 0, 0, 0, 32, 31, 1, 0, 0, 0, 33, 34, 1, 0, 0, 0, 34, 32, 1, 0, 0, 0, 34, 35, 1, 0, 0, 0, 35, 8, 1, 0, 0, 0, 36, 38, 7, 1, 0, 0, 37, 36, 1, 0, 0, 0, 38, 39, 1, 0, 0, 0, 39, 37, 1, 0, 0, 0, 39, 40, 1, 0, 0, 0, 40, 41, 1, 0, 0, 0, 41, 42, 6, 4, 0, 0, 42, 10, 1, 0, 0, 0, 3, 0, 34, 39, 1, 6, 0, 0]
\ No newline at end of file
diff --git a/Week_3/week3Lexer.py b/Week_3/week3Lexer.py
index f4fee75..9016d79 100644
--- a/Week_3/week3Lexer.py
+++ b/Week_3/week3Lexer.py
@@ -10,16 +10,21 @@ else:
 
 def serializedATN():
     return [
-        4,0,3,27,6,-1,2,0,7,0,2,1,7,1,2,2,7,2,1,0,1,0,1,0,1,0,1,0,1,0,1,
-        0,1,0,1,1,4,1,17,8,1,11,1,12,1,18,1,2,4,2,22,8,2,11,2,12,2,23,1,
-        2,1,2,0,0,3,1,1,3,2,5,3,1,0,2,2,0,65,90,97,122,3,0,9,10,13,13,32,
-        32,28,0,1,1,0,0,0,0,3,1,0,0,0,0,5,1,0,0,0,1,7,1,0,0,0,3,16,1,0,0,
-        0,5,21,1,0,0,0,7,8,5,109,0,0,8,9,5,105,0,0,9,10,5,110,0,0,10,11,
-        5,105,0,0,11,12,5,109,0,0,12,13,5,97,0,0,13,14,5,108,0,0,14,2,1,
-        0,0,0,15,17,7,0,0,0,16,15,1,0,0,0,17,18,1,0,0,0,18,16,1,0,0,0,18,
-        19,1,0,0,0,19,4,1,0,0,0,20,22,7,1,0,0,21,20,1,0,0,0,22,23,1,0,0,
-        0,23,21,1,0,0,0,23,24,1,0,0,0,24,25,1,0,0,0,25,26,6,2,0,0,26,6,1,
-        0,0,0,3,0,18,23,1,6,0,0
+        4,0,5,43,6,-1,2,0,7,0,2,1,7,1,2,2,7,2,2,3,7,3,2,4,7,4,1,0,1,0,1,
+        0,1,0,1,0,1,0,1,0,1,0,1,1,1,1,1,1,1,1,1,2,1,2,1,2,1,2,1,2,1,2,1,
+        2,1,2,1,3,4,3,33,8,3,11,3,12,3,34,1,4,4,4,38,8,4,11,4,12,4,39,1,
+        4,1,4,0,0,5,1,1,3,2,5,3,7,4,9,5,1,0,2,2,0,65,90,97,122,3,0,9,10,
+        13,13,32,32,44,0,1,1,0,0,0,0,3,1,0,0,0,0,5,1,0,0,0,0,7,1,0,0,0,0,
+        9,1,0,0,0,1,11,1,0,0,0,3,19,1,0,0,0,5,23,1,0,0,0,7,32,1,0,0,0,9,
+        37,1,0,0,0,11,12,5,109,0,0,12,13,5,105,0,0,13,14,5,110,0,0,14,15,
+        5,105,0,0,15,16,5,109,0,0,16,17,5,97,0,0,17,18,5,108,0,0,18,2,1,
+        0,0,0,19,20,5,98,0,0,20,21,5,121,0,0,21,22,5,101,0,0,22,4,1,0,0,
+        0,23,24,5,103,0,0,24,25,5,111,0,0,25,26,5,111,0,0,26,27,5,100,0,
+        0,27,28,5,98,0,0,28,29,5,121,0,0,29,30,5,101,0,0,30,6,1,0,0,0,31,
+        33,7,0,0,0,32,31,1,0,0,0,33,34,1,0,0,0,34,32,1,0,0,0,34,35,1,0,0,
+        0,35,8,1,0,0,0,36,38,7,1,0,0,37,36,1,0,0,0,38,39,1,0,0,0,39,37,1,
+        0,0,0,39,40,1,0,0,0,40,41,1,0,0,0,41,42,6,4,0,0,42,10,1,0,0,0,3,
+        0,34,39,1,6,0,0
     ]
 
 class week3Lexer(Lexer):
@@ -29,20 +34,22 @@ class week3Lexer(Lexer):
     decisionsToDFA = [ DFA(ds, i) for i, ds in enumerate(atn.decisionToState) ]
 
     T__0 = 1
-    ID = 2
-    WS = 3
+    T__1 = 2
+    T__2 = 3
+    ID = 4
+    WS = 5
 
     channelNames = [ u"DEFAULT_TOKEN_CHANNEL", u"HIDDEN" ]
 
     modeNames = [ "DEFAULT_MODE" ]
 
     literalNames = [ "<INVALID>",
-            "'minimal'" ]
+            "'minimal'", "'bye'", "'goodbye'" ]
 
     symbolicNames = [ "<INVALID>",
             "ID", "WS" ]
 
-    ruleNames = [ "T__0", "ID", "WS" ]
+    ruleNames = [ "T__0", "T__1", "T__2", "ID", "WS" ]
 
     grammarFileName = "week3.g4"
 
diff --git a/Week_3/week3Lexer.tokens b/Week_3/week3Lexer.tokens
index d02f47c..9e492d1 100644
--- a/Week_3/week3Lexer.tokens
+++ b/Week_3/week3Lexer.tokens
@@ -1,4 +1,8 @@
 T__0=1
-ID=2
-WS=3
+T__1=2
+T__2=3
+ID=4
+WS=5
 'minimal'=1
+'bye'=2
+'goodbye'=3
diff --git a/Week_3/week3Listener.py b/Week_3/week3Listener.py
index cb1ae67..4b84ac7 100644
--- a/Week_3/week3Listener.py
+++ b/Week_3/week3Listener.py
@@ -17,5 +17,14 @@ class week3Listener(ParseTreeListener):
         pass
 
 
+    # Enter a parse tree produced by week3Parser#bye.
+    def enterBye(self, ctx:week3Parser.ByeContext):
+        pass
+
+    # Exit a parse tree produced by week3Parser#bye.
+    def exitBye(self, ctx:week3Parser.ByeContext):
+        pass
+
+
 
 del week3Parser
\ No newline at end of file
diff --git a/Week_3/week3Parser.py b/Week_3/week3Parser.py
index 7475268..1fd46a1 100644
--- a/Week_3/week3Parser.py
+++ b/Week_3/week3Parser.py
@@ -10,8 +10,9 @@ else:
 
 def serializedATN():
     return [
-        4,1,3,6,2,0,7,0,1,0,1,0,1,0,1,0,0,0,1,0,0,0,4,0,2,1,0,0,0,2,3,5,
-        1,0,0,3,4,5,2,0,0,4,1,1,0,0,0,0
+        4,1,5,11,2,0,7,0,2,1,7,1,1,0,1,0,1,0,1,1,1,1,1,1,1,1,0,0,2,0,2,0,
+        1,1,0,2,3,8,0,4,1,0,0,0,2,7,1,0,0,0,4,5,5,1,0,0,5,6,5,4,0,0,6,1,
+        1,0,0,0,7,8,7,0,0,0,8,9,5,4,0,0,9,3,1,0,0,0,0
     ]
 
 class week3Parser ( Parser ):
@@ -24,18 +25,22 @@ class week3Parser ( Parser ):
 
     sharedContextCache = PredictionContextCache()
 
-    literalNames = [ "<INVALID>", "'minimal'" ]
+    literalNames = [ "<INVALID>", "'minimal'", "'bye'", "'goodbye'" ]
 
-    symbolicNames = [ "<INVALID>", "<INVALID>", "ID", "WS" ]
+    symbolicNames = [ "<INVALID>", "<INVALID>", "<INVALID>", "<INVALID>", 
+                      "ID", "WS" ]
 
     RULE_start = 0
+    RULE_bye = 1
 
-    ruleNames =  [ "start" ]
+    ruleNames =  [ "start", "bye" ]
 
     EOF = Token.EOF
     T__0=1
-    ID=2
-    WS=3
+    T__1=2
+    T__2=3
+    ID=4
+    WS=5
 
     def __init__(self, input:TokenStream, output:TextIO = sys.stdout):
         super().__init__(input, output)
@@ -76,9 +81,58 @@ class week3Parser ( Parser ):
         self.enterRule(localctx, 0, self.RULE_start)
         try:
             self.enterOuterAlt(localctx, 1)
-            self.state = 2
+            self.state = 4
             self.match(week3Parser.T__0)
-            self.state = 3
+            self.state = 5
+            self.match(week3Parser.ID)
+        except RecognitionException as re:
+            localctx.exception = re
+            self._errHandler.reportError(self, re)
+            self._errHandler.recover(self, re)
+        finally:
+            self.exitRule()
+        return localctx
+
+
+    class ByeContext(ParserRuleContext):
+        __slots__ = 'parser'
+
+        def __init__(self, parser, parent:ParserRuleContext=None, invokingState:int=-1):
+            super().__init__(parent, invokingState)
+            self.parser = parser
+
+        def ID(self):
+            return self.getToken(week3Parser.ID, 0)
+
+        def getRuleIndex(self):
+            return week3Parser.RULE_bye
+
+        def enterRule(self, listener:ParseTreeListener):
+            if hasattr( listener, "enterBye" ):
+                listener.enterBye(self)
+
+        def exitRule(self, listener:ParseTreeListener):
+            if hasattr( listener, "exitBye" ):
+                listener.exitBye(self)
+
+
+
+
+    def bye(self):
+
+        localctx = week3Parser.ByeContext(self, self._ctx, self.state)
+        self.enterRule(localctx, 2, self.RULE_bye)
+        self._la = 0 # Token type
+        try:
+            self.enterOuterAlt(localctx, 1)
+            self.state = 7
+            _la = self._input.LA(1)
+            if not(_la==2 or _la==3):
+                self._errHandler.recoverInline(self)
+            else:
+                self._errHandler.reportMatch(self)
+                self.consume()
+            self.state = 8
             self.match(week3Parser.ID)
         except RecognitionException as re:
             localctx.exception = re