diff --git a/kyu_2/evaluate_mathematical_expression/evaluate.py b/kyu_2/evaluate_mathematical_expression/evaluate.py
index 4d578001574..44b06f82fa7 100644
--- a/kyu_2/evaluate_mathematical_expression/evaluate.py
+++ b/kyu_2/evaluate_mathematical_expression/evaluate.py
@@ -198,4 +198,4 @@ def normalize_string(string: str) -> str:
                     strings.append(temp)
                 string_temp = ''
 
-    return ' '.join([s for s in strings])
+    return ' '.join(strings)