exit function added

@@ -8,7 +8,10 @@ int main()
 	while (1)
 	while (1)
 	{
 	{
 		cin >> str;
 		cin >> str;
+		if (str == "exit")
+			break;
 		cout << str << endl;
 		cout << str << endl;
+		
 	}
 	}
 
 
 	return 0;
 	return 0;