diff --git a/buggy.py b/buggy.py
--- a/buggy.py
+++ b/buggy.py
@@ -44,7 +44,7 @@
 for i in range(H):
     for j in range(W):
         if a[i][j] == "S":
-            s = [i, j]
+            start = [i, j]
         if a[i][j] == "G":
             g = [i, j]
         if a[i][j] == "o":
