diff --git a/buggy.py b/buggy.py
--- a/buggy.py
+++ b/buggy.py
@@ -12,7 +12,7 @@
         cnt1 = Counter(s)
         cnt2 = Counter(t)
         sm = 0
-        cnt = cnt1 + cnt2
+        cnt = cnt1 - cnt2 + (cnt2 - cnt1)
         for i in cnt.values():
             sm += i
         return sm
