diff --git a/buggy.py b/buggy.py
--- a/buggy.py
+++ b/buggy.py
@@ -10,7 +10,7 @@
         if A[i][j] == 0:
             s += "."
         else:
-            s += chr(ord("A") + A[i][j] + 1)
+            s += chr(ord("A") + A[i][j] - 1)
     strings.append(s)
 
 for s in strings:
