input: def extract_non_vowel_words(sentence: str) -> list:
      """ Extract non-vowel words from a given sentence.
      >>> extract_non_vowel_words("This machine learning project is challenging.")
      ['machine', 'learning', 'project', 'is', 'challenging.']
      """
output:     vowels = "aeiouAEIOU"
      words = sentence.split()
      non_vowel_words = [word for word in words if not any(char in vowels for char in word)]
      return non_vowel_words