input: Write a function to determine if a given sentence is an 'affirmative' sentence or a 'negative' sentence. If the sentence contains negation words, it should be classified as 'Negative', otherwise 'Affirmative'. If the sentence is empty, return 'Affirmative'.
  assert isAffirmativeorNegative("He always comes late but I dont mind.") == "Negative"
  assert isAffirmativeorNegative("She loves to read books.") == "Affirmative"
  assert isAffirmativeorNegative("No one was present at the meeting.") == "Negative"
  assert isAffirmativeorNegative("") == "Affirmative"
output: def isAffirmativeorNegative(sentence):
      negation_words = ["no", "not", "never", "none", "nobody", "nothing", "neither", "nor"]
      if not sentence:
          return "Affirmative"
      for word in sentence.split():
          if word.lower() in negation_words:
              return "Negative"
      return "Affirmative"