code: def _get_number_from_sign(sign):
          
          match = re.search(r'\d{1,3}$', sign)
          if match is None:
              number = 0
          else:
              number = match[0]
          return sign, int(number)
docs: Captures numbers after sign for __convert_num__.
  
          input = ["a", "a1", "be2", "bad3", "buru14"]
          output = [0, 1, 2, 3, 14]
  
          :param sign: string
          :return: string, integer