input: from typing import List
  
  def print_reverse_array(arr: List[str]) -> None:
      """ Print out the given array backwards.
      >>> print_reverse_array(['a', 'b', 'c'])
      c
      b
      a
      >>> print_reverse_array(['1', '2', '3', '4'])
      4
      3
      2
      1
      """
output:     for i in range(len(arr) - 1, -1, -1):
          print(arr[i])