input: def print_reverse_array(arr):
      """Print out the elements of the array in reverse order.
      >>> print_reverse_array([1, 2, 3, 4])
      4
      3
      2
      1
      >>> print_reverse_array(['a', 'b', 'c'])
      c
      b
      a
      """
output:     for element in reversed(arr):
          print(element)