diff --git a/4/script.py b/4/script.py
index 181489d..029dc51 100644
--- a/4/script.py
+++ b/4/script.py
@@ -3,8 +3,13 @@ def parseline(line):
     input_split = meaningful_input.split("|")
     winning_numbers = input_split[0].strip().split(" ")
     your_numbers = input_split[1].strip().split(" ")
-    return winning_numbers, your_numbers
+    no_empty_win = list(filter(lambda x: x != '', winning_numbers))
+    no_empty_yours = list(filter(lambda x: x != '', your_numbers))
+    return no_empty_win, no_empty_yours
 
+def detect_duplicates(list_of_nums):
+    print(list_of_nums)
+    return len(set(list_of_nums)) != len(list_of_nums)
 
 def get_point_value_for_line(winning_numbers, your_numbers):
     count = 0
@@ -22,8 +27,14 @@ def get_point_value_for_line(winning_numbers, your_numbers):
 def get_lines(filename):
     values = []
     with open(filename, "r") as inputfile:
-        for line in inputfile:
+        for index, line in enumerate(inputfile):
+            newindex = index + 1
             winning_numbers, your_numbers = parseline(line)
+
+            if detect_duplicates(winning_numbers):
+                print(f"Card {newindex}: Winning numbers has duplicates")
+            if detect_duplicates(your_numbers):
+                print(f"Card {newindex}: your numbers has duplicates")
             value = get_point_value_for_line(winning_numbers, your_numbers)
             values.append(value)
     return sum(values)