input: Write a function to sort a list of numbers from highest to lowest.
  assert sort_highest_to_lowest([6, 2, 8, 3, 9]) == [9, 8, 6, 3, 2]
  assert sort_highest_to_lowest([5, 1, 4, 2, 7]) == [7, 5, 4, 2, 1]
  assert sort_highest_to_lowest([10, 30, 20]) == [30, 20, 10]
output: def sort_highest_to_lowest(numbers):
      return sorted(numbers, reverse=True)