diff --git a/strings/longest_word_in_sentence.py b/strings/longest_word_in_sentence.py
index 0d81d7910..4389236d8 100644
--- a/strings/longest_word_in_sentence.py
+++ b/strings/longest_word_in_sentence.py
@@ -23,6 +23,8 @@ def longest_word(sentence: str) -> str:
     words = sentence.split()
     return max(words, key=len) if words else ""
 
+
 if __name__ == "__main__":
     from doctest import testmod
+
     testmod()