diff --git a/is_anagram/anagram.py b/is_anagram/anagram.py
index 16c81b2..c609b71 100644
--- a/is_anagram/anagram.py
+++ b/is_anagram/anagram.py
@@ -19,4 +19,16 @@ def is_anagram_v2(string1, string2):
     return letters1 == letters2
 
 
-is_anagram = is_anagram_v2
+def is_anagram_v3(string1, string2):
+    if len(string1) != len(string2):
+        return False
+    letters1, letters2 = list(string1.lower()), list(string2.lower())
+    for letter in letters1:
+        try:
+            letters2.remove(letter)
+        except ValueError:
+            return False
+    return True
+
+
+is_anagram = is_anagram_v3