add exit_func

 #include <iostream>
 #include <iostream>
 #include <string>
 #include <string>
 using namespace std;
 using namespace std;
+int exit_func(string a)
+{
+	string exit = "exit";
+	if(a.compare(b) == 0)
+		return 0;
+	else
+		return 1;
+}
 
 
 int main()
 int main()
 {
 {
 	string std;
 	string std;
 	cin >> std;
 	cin >> std;
 	cout << std;
 	cout << std;
+	if(exit_func(std))
+		;
+	else
+		return 0;
 	return 0;
 	return 0;
 }
 }