input: Write a function to sort the given list in descending order using Python. The function should take a list as input and return the sorted list.
  
  assert sort_descending([3, 7, 5, 8, 10])==[10, 8, 7, 5, 3]
  assert sort_descending([1, 2, 3, 4, 5])==[5, 4, 3, 2, 1]
  assert sort_descending([])==[]
  assert sort_descending([9, 1, 7, 3, 5])==[9, 7, 5, 3, 1]
output: def sort_descending(lst):
      return sorted(lst, reverse=True)