diff --git a/Leetcode-Hard/32. Longest Valid Parenthesis b/Leetcode-Hard/32. Longest Valid Parenthesis
new file mode 100644
index 0000000..3d5f338
--- /dev/null
+++ b/Leetcode-Hard/32. Longest Valid Parenthesis	
@@ -0,0 +1,16 @@
+class Solution:
+    def longestValidParentheses(self, s: str) -> int:
+        count=0
+        stack = []
+        stack.append(-1)
+        for i in range(len(s)):
+            if s[i]=='(':
+                stack.append(i)
+            else:
+                stack.pop()
+                if len(stack)==0:
+                    stack.append(i)
+                else:
+                    count = max(count,i-stack[-1])
+                    
+        return count