input: Write a function to determine if a given sentence is an 'affirmative' sentence or a 'negative' sentence using a predefined set of negation words. If no negation words are found in the sentence, it is considered 'affirmative'. Otherwise, it is considered 'negative'. If the input sentence is empty or None, return "Invalid Input".
  assert isAffirmativeorNegative("He always comes late but I dont mind.") == "Negative"
  assert isAffirmativeorNegative("They work diligently every day.") == "Affirmative"
  assert isAffirmativeorNegative("She never eats breakfast.") == "Negative"
  assert isAffirmativeorNegative("") == "Invalid Input"
  assert isAffirmativeorNegative(None) == "Invalid Input"
output: def isAffirmativeorNegative(sentence):
      if sentence is None or sentence == "":
          return "Invalid Input"
      negation_words = {"not", "never", "no", "dont", "doesnt", "didnt", "cant", "wont", "isnt", "arent"}
      words = sentence.lower().split()
      for word in words:
          if word in negation_words:
              return "Negative"
      return "Affirmative"