diff --git a/strings/longest_word_in_sentence.py b/strings/longest_word_in_sentence.py
index f3fc36b8f..4389236d8 100644
--- a/strings/longest_word_in_sentence.py
+++ b/strings/longest_word_in_sentence.py
@@ -21,8 +21,10 @@ def longest_word(sentence: str) -> str:
     'thousand'
     """
     words = sentence.split()
-    return max(words, key=len) if words else ''
+    return max(words, key=len) if words else ""
+
 
 if __name__ == "__main__":
     from doctest import testmod
+
     testmod()