new_contents: import string
  
  
  def decrypt(word):
      table = {}
  
      for i, letter in enumerate(string.ascii_uppercase):
          translated = string.ascii_uppercase[((66 + i) * 3 - 2) % len(string.ascii_uppercase)]
          table[translated] = letter
  
      return ''.join([table[letter] for letter in word])
  
  
  def test_decrypt():
      assert decrypt('PWVAYOBB') == 'JULEMANN'
  
  
  if __name__ == "__main__":
      print(decrypt('OTUJNMQTYOQOVVNEOXQVAOXJEYA'))
  
subject: Solve knowit2017/7