input: from typing import List
  
  def findNegation(sentence: str) -> List[str]:
      """Identify and return the list of negation words found in the given sentence.
      >>> findNegation("He always comes late but I dont mind.")
      ['dont']
      >>> findNegation("There is no problem at all.")
      ['no']
      """
      negationwords = {'not', 'never', 'no', 'none', 'non', 'neither',
                       'nobody', 'nowhere', 'cannot', 'couldnt', 'shouldnt', 
                       'wouldnt', 'dont', 'didnt', 'hasnt', 'havent', 'isnt', 'arent'} 
      words = nltk.word_tokenize(sentence)
      neg = []
      for word in words:
          if word in negationwords:
              neg.append(word)
      return neg
  
  def isAffirmativeorNegative(sentence: str) -> str:
      """Determine whether the given sentence is affirmative or negative based on the presence of negation words.
      >>> isAffirmativeorNegative("He always comes late but I dont mind.")
      'Negative'
      >>> isAffirmativeorNegative("Everything is going well.")
      'Affirmative'
      """
      negationwords = findNegation(sentence)
      if len(negationwords) == 0: 
          return "Affirmative" 
      else: 
          return "Negative"
output:     negation_words = findNegation(sentence)
      if negation_words:
          return "Negative"
      else:
          return "Affirmative"