old_contents: class NumberToWords(object):
      """
      Class for converting positive integer values to a textual representation
      of the submitted number for value of 0 up to 999999999.
      """
  
new_contents: class NumberToWords(object):
      """
      Class for converting positive integer values to a textual representation
      of the submitted number for value of 0 up to 999999999.
      """
  
      MAX = 999999999
      SMALL_NUMBERS = ['', 'one', 'two', 'three', 'four', 'five', 'six',
                       'seven', 'eight', 'nine', 'ten', 'eleven',
                       'twelve', 'thirteen', 'fourteen', 'fifteen', 'sixteen',
                       'seventeen', 'eighteen', 'nineteen']
      TENS = ['', '', 'twenty', 'thirty', 'fourty', 'fifty', 'sixty', 'seventy',
              'eighty', 'ninety']
      LARGE_NUMBERS = ['', 'thousand', 'million']
  
subject: Add constants