input: Write a python function to sort a list in descending order.
  assert sort_list([1, 3, 2, 4, 5]) == [5, 4, 3, 2, 1]
  assert sort_list([10, 20, 5, 3, 8]) == [20, 10, 8, 5, 3]
  assert sort_list([7, 7, 7, 7, 7]) == [7, 7, 7, 7, 7]
output: def sort_list(lst):
      return sorted(lst, reverse=True)