input: Write a function to sort a list of numbers in ascending order.
  assert sort_ascending([5, 2, 9, 1, 5, 6]) == [1, 2, 5, 5, 6, 9]
  assert sort_ascending([3, 0, -1, 8, 7, 3]) == [-1, 0, 3, 3, 7, 8]
  assert sort_ascending([10, 20, 30, 5, 15]) == [5, 10, 15, 20, 30]
output: def sort_ascending(numbers):
      return sorted(numbers)