input: Write a python function to sort a list of integers in ascending order.
  assert sort([64, 34, 25, 12, 22, 11, 90]) == [11, 12, 22, 25, 34, 64, 90]
  assert sort([3, 2, 1, 5, 4]) == [1, 2, 3, 4, 5]
  assert sort([10, 9, 8, 7]) == [7, 8, 9, 10]
output: def sort(lst):
      return sorted(lst)