code: def int_to_string(number, alphabet, padding=None):
      
      output = ""
      alpha_len = len(alphabet)
      while number:
          number, digit = divmod(number, alpha_len)
          output += alphabet[digit]
      if padding:
          remainder = max(padding - len(output), 0)
          output = output + alphabet[0] * remainder
      return output[::-1]
docs: Convert a number to a string, using the given alphabet.
      The output has the most significant digit first.