input: Write a function to print an array backwards.
  def print_reverse_array(arr):
   for i in range(len(arr)-1, -1, -1): 
    print(arr[i])
  
  assert print_reverse_array([1, 2, 3, 4, 5])==None
  assert print_reverse_array([7, 8, 9, 10])==None
  assert print_reverse_array([11, 22, 33, 44, 55, 66])==None
  assert print_reverse_array([100, 200, 300, 400, 500])==None
output: def print_reverse_array(arr):
   for i in range(len(arr)-1, -1, -1): 
    print(arr[i])