diff --git a/06/f.py b/06/f.py
index 068bac1..09ea039 100644
--- a/06/f.py
+++ b/06/f.py
@@ -5,12 +5,10 @@ input = open(os.path.dirname(__file__) +
 
 
 def findUniq(length):
-    ind = 0
-    for x in input:
-        ind += 1
-        if len(set(input[ind:ind+length])) == length:
-            return ind+length
-    return False
+    for i in range(len(input)):
+        if len(set(input[i:i+length])) == length:
+            return i+length
+    return -1
 
 
 print("First answer: " + str(findUniq(4)))