input: Write a function to determine if a given sentence is an 'affirmative' sentence or a 'negative' sentence. The function should return "Affirmative" if the sentence contains no negation words, otherwise, it should return "Negative". If the sentence is empty, it should return "Affirmative".
  
  assert isAffirmativeorNegative("He always comes late but I dont mind.") == "Negative"
  assert isAffirmativeorNegative("She works hard every day.") == "Affirmative"
  assert isAffirmativeorNegative("There is no confusion about the task.") == "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 negation_words:
          if word in sentence.lower():
              return "Negative"
      return "Affirmative"