input: 
  def isAffirmativeorNegative(sentence: str) -> str:
      """ Determine if the given sentence is affirmative or negative based on the presence of negation words.
      >>> isAffirmativeorNegative("He always comes late but I dont mind.")
      'Negative'
      >>> isAffirmativeorNegative("She is always on time.")
      'Affirmative'
      """
  
output:     negation_words = {"not", "never", "no", "dont", "doesnt", "wont", "isnt", "arent", "havent", "hasnt", "hadnt", "cant", "couldnt", "shouldnt", "wouldnt", "mightnt", "mustnt"}
      words = sentence.lower().split()
      for word in words:
          if word in negation_words:
              return 'Negative'
      return 'Affirmative'