input: def print_reverse_array(arr: List[int]) -> None:
      """
      Prints the elements of the given array in reverse order.
      >>> print_reverse_array([1, 2, 3, 4])
      4
      3
      2
      1
      >>> print_reverse_array([9, 7, 5, 3, 1])
      1
      3
      5
      7
      9
      """
output:     for i in range(len(arr)-1, -1, -1):
          print(arr[i])