new_contents: """Leetcode 273. Integer to English Words
  Hard
  
  URL: https://leetcode.com/problems/integer-to-english-words/
  
  Convert a non-negative integer to its english words representation.
  Given input is guaranteed to be less than 231 - 1.
  
  Example 1:
  Input: 123
  Output: "One Hundred Twenty Three"
  
  Example 2:
  Input: 12345
  Output: "Twelve Thousand Three Hundred Forty Five"
  
  Example 3:
  Input: 1234567
  Output: "One Million Two Hundred Thirty Four Thousand Five Hundred Sixty Seven"
  
  Example 4:
  Input: 1234567891
  Output: "One Billion Two Hundred Thirty Four Million Five Hundred Sixty Seven
  Thousand Eight Hundred Ninety One"
  """
  
  class Solution(object):
      def numberToWords(self, num):
          """
          :type num: int
          :rtype: str
          """
          pass
  
  
  def main():
      pass
  
  
  if __name__ == '__main__':
      main()
  
subject: Add lc0273_integer_to_english_words.py