input: Write a python function to sort a list of integers.
  assert sort_list_of_integers([5, 7, 3, 2, 9])==[2, 3, 5, 7, 9]
  assert sort_list_of_integers([10, 5, 3, 8, 2])==[2, 3, 5, 8, 10]
  assert sort_list_of_integers([1, 2, 3, 4, 5])==[1, 2, 3, 4, 5]
output: def sort_list_of_integers(lst):
      return sorted(lst)