diff --git a/buggy.py b/buggy.py
--- a/buggy.py
+++ b/buggy.py
@@ -1,5 +1,5 @@
 S = input()
-if S.upper() != S and S.lower() != S and set(list(S)) == len(S):
+if S.upper() != S and S.lower() != S and len(set(list(S))) == len(S):
     print("Yes")
 else:
     print("No")
