diff --git a/buggy.py b/buggy.py
--- a/buggy.py
+++ b/buggy.py
@@ -6,6 +6,6 @@
 
 for i in range(4 * N - 1):
     if A[i] != B[i // 4]:
-        print(A[i])
+        print(A[i] - 1)
         exit()
 print(A[-1])
