input: Write a python function to sort a list in ascending order.
  assert sort_ascending([7, 3, 5, 0, 2, 1])==[0, 1, 2, 3, 5, 7]
  assert sort_ascending([10, 20, 5, 15, 25])==[5, 10, 15, 20, 25]
  assert sort_ascending([1, 1, 1, 0, 0, 0])==[0, 0, 0, 1, 1, 1]
output: def sort_ascending(lst):
      return sorted(lst)