input: Write a python function to sort a list of numbers in descending order.
  assert descendingSort([2, 4, 1, 6, 9, 8]) == [9, 8, 6, 4, 2, 1]
  assert descendingSort([10, 5, 7, 3, 1, 2]) == [10, 7, 5, 3, 2, 1]
  assert descendingSort([7, 3, 5, 1, 9, 4]) == [9, 7, 5, 4, 3, 1]
output: def descendingSort(lst):
      return sorted(lst, reverse=True)