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 should be classified as 'Negative'; otherwise, it should be classified as 'Affirmative'. If the sentence is empty, it should be considered as 'Affirmative'.
  assert isAffirmativeorNegative("He always comes late but I dont mind.") == "Negative"
  assert isAffirmativeorNegative("She will definitely attend the meeting.") == "Affirmative"
  assert isAffirmativeorNegative("He has not completed the assignment.") == "Negative"
  assert isAffirmativeorNegative("No one knows the answer.") == "Negative"
  assert isAffirmativeorNegative("") == "Affirmative"
output: def isAffirmativeorNegative(sentence):
      negation_words = ["not", "no", "never", "none", "nobody", "nothing", "nowhere", "neither", "nor"]
      words = sentence.lower().split()
      for word in words:
          if word in negation_words:
              return "Negative"
      return "Affirmative"