diff --git a/TaskA04/task4.py b/TaskA04/task4.py
index 88c5316..72fbf94 100644
--- a/TaskA04/task4.py
+++ b/TaskA04/task4.py
@@ -1,5 +1,7 @@
 with open('polish_wiki_excerpt.in', encoding='utf8') as f:
     lines = f.readlines()
+    results = []
+    i = 0
     for line in lines:
         line = line.strip()
 
@@ -7,7 +9,7 @@ with open('polish_wiki_excerpt.in', encoding='utf8') as f:
         pom = ''
 
         for char in line:
-            if char.isdigit():
+            if char in '0123456789':
                 pom += char
             elif pom != '':
                 subdigits.append(pom)