code: def positional_number_string(n):
      
      if n > 20:
          suffix = positional_suffix[n % 10]
          return "%d%s" % (n, suffix)
      elif n > 3:
          return "%dth" % n
      elif n == 3:
          return "third"
      elif n == 2:
          return "second"
      elif n == 1:
          return "first"
      return "zeroeth"
docs: Print the position string equivalent of a positive integer. Examples:
  
          0: zeroeth
          1: first
          2: second
          14: 14th
          21: 21st