diff --git a/Top150Interview/20_Valid_Parenthesis.py b/Top150Interview/20_Valid_Parenthesis.py
new file mode 100644
index 0000000..e488cc8
--- /dev/null
+++ b/Top150Interview/20_Valid_Parenthesis.py
@@ -0,0 +1,6 @@
+def isValid(self, s):
+    """
+    :type s: str
+    :rtype: bool
+    """
+    
\ No newline at end of file