input: Write a function to determine if a given sentence is an 'affirmative' sentence or a 'negative' sentence. If the sentence contains negation words, return "Negative", otherwise return "Affirmative".
  assert isAffirmativeorNegative("He always comes late but I dont mind.") == "Negative"
  assert isAffirmativeorNegative("She is always on time.") == "Affirmative"
  assert isAffirmativeorNegative("Nobody likes to be late.") == "Negative"
  assert isAffirmativeorNegative("The sun is shining brightly.") == "Affirmative"
output: def isAffirmativeorNegative(sentence):
      negation_words = {"not", "no", "never", "dont", "doesnt", "didnt", "wont", "cant", "shouldnt", "wouldnt", "isnt", "arent", "wasnt", "werent", "hasnt", "havent", "hadnt", "cannot", "nobody", "none", "nothing"}
      words = set(sentence.lower().split())
      if negation_words & words:
          return "Negative"
      else:
          return "Affirmative"