diff --git a/06/f.py b/06/f.py
index 09ea039..6cc830d 100644
--- a/06/f.py
+++ b/06/f.py
@@ -4,7 +4,7 @@ input = open(os.path.dirname(__file__) +
              "/input.txt", "r").read()
 
 
-def findUniq(length):
+def findUniq(length: int):
     for i in range(len(input)):
         if len(set(input[i:i+length])) == length:
             return i+length