Update longest_valid_parenthesis.py

added longest_valid_parenthesis.py

Author: AryanMankame

strings/longest_valid_parenthesis.py

@@ -27,9 +27,6 @@ def longest_valid_parenthesis(self, s: str) -> int:
     while stack:
         res = max(res, stack.pop())
     return res * 2
-
-
 if __name__ == "__main__":
-    from doctest import testmod
-
-    testmod()
+    s = input()
+    print(longest_valid_parenthesis(s))