input: def print_reverse_array(arr):
      """
      Print the given array backwards.
      
      Example:
      >>> print_reverse_array([1, 2, 3, 4])
      4
      3
      2
      1
      >>> print_reverse_array([])
      >>> print_reverse_array([5])
      5
      """
      for i in range(len(arr)-1, -1, -1):
          print(arr[i])
output:     for i in range(len(arr)-1, -1, -1):
          print(arr[i])