input: Write a function to determine if a given sentence is an 'affirmative' sentence or a 'negative' sentence. If the sentence contains any negation words, it is considered a 'negative' sentence. If no negation words are found, it is considered an 'affirmative' sentence. If the input sentence is empty, return "Affirmative".
  assert isAffirmativeorNegative("He always comes late but I dont mind.") == "Negative"
  assert isAffirmativeorNegative("She is always on time.") == "Affirmative"
  assert isAffirmativeorNegative("I cannot go to the party tonight.") == "Negative"
  assert isAffirmativeorNegative("We will have a meeting tomorrow.") == "Affirmative"
  assert isAffirmativeorNegative("") == "Affirmative"
output: def isAffirmativeorNegative(sentence):
      negation_words = ["not", "no", "never", "dont", "cant", "cannot", "wont"]
      if not sentence:
          return "Affirmative"
      for word in sentence.split():
          if word.lower() in negation_words:
              return "Negative"
      return "Affirmative"