diff --git a/u2/list_ops.py b/u2/list_ops.py
index 252486a..1ecfbef 100644
--- a/u2/list_ops.py
+++ b/u2/list_ops.py
@@ -15,3 +15,10 @@ def filter(function, list):
     if function(item) :
         res = res + item
     return res
+def length(list) :
+    counter = 0
+    for item in list:
+        counter = counter + 1
+    return counter
+    
+        
\ No newline at end of file