diff --git a/Python Solutions/D21P2_LeetCode_921.py b/Python Solutions/D21P2_LeetCode_921.py
index 8b3de34..a83aac1 100644
--- a/Python Solutions/D21P2_LeetCode_921.py	
+++ b/Python Solutions/D21P2_LeetCode_921.py	
@@ -1 +1,13 @@
-# Python3 code coming soon
\ No newline at end of file
+class Solution:
+    def minAddToMakeValid(self, s: str) -> int:
+        stack = []
+        count = 0
+        for ch in s:
+            if ch == '(':
+                stack.append(ch)
+            else:
+                if stack and stack[-1] == '(':
+                    stack.pop()
+                else:
+                    count += 1
+        return count+len(stack)