input: Write a function to check if a given sentence is an 'affirmative' sentence or a 'negative' sentence. The function should return "Affirmative" if there are no negation words in the sentence, otherwise, it should return "Negative".
  assert isAffirmativeorNegative("He always comes late but I dont mind.") == "Negative"
  assert isAffirmativeorNegative("I will go to the park.") == "Affirmative"
  assert isAffirmativeorNegative("No one was there.") == "Negative"
  assert isAffirmativeorNegative("She has never been to Paris.") == "Negative"
  assert isAffirmativeorNegative("It is a beautiful day.") == "Affirmative"
output: def isAffirmativeorNegative(sentence):
      negation_words = {"no", "not", "never", "dont", "doesnt", "didnt", "cant", "wont", "isnt", "arent"}
      words = sentence.lower().split()
      for word in words:
          if word in negation_words:
              return "Negative"
      return "Affirmative"