input: Write a Python function to find the descending order permutation of a list of integers.
  assert descending_order([4, 7, 2, 1]) == [7, 4, 2, 1]
  assert descending_order([1, 2, 3, 4]) == [4, 3, 2, 1]
  assert descending_order([3, 2, 1]) == [3, 2, 1]
  assert descending_order([9, 7, 8]) == [9, 8, 7]
output: def descending_order(lst):
      return sorted(lst, reverse=True)