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