diff --git a/buggy.py b/buggy.py
--- a/buggy.py
+++ b/buggy.py
@@ -1,6 +1,6 @@
 N = int(input())
 S = list(input())
-if "○" in S and "x" not in S:
+if "o" in S and "x" not in S:
     print("Yes")
 else:
     print("No")
