diff --git a/Python/Sets/Set_.difference()_Operation.py b/Python/Sets/Set_.difference()_Operation.py
index c64e759..d83d75b 100644
--- a/Python/Sets/Set_.difference()_Operation.py
+++ b/Python/Sets/Set_.difference()_Operation.py
@@ -49,4 +49,4 @@
 fren_num = int(raw_input())
 fren_set = set(map(int, raw_input().split()))
 
-print len(eng_set.difference(fren_set))
+print len(eng_set.symmetric_difference(fren_set))