input: Write a python function to sort an array in ascending order.
  assert sort_ascending([5, 3, 6, 1, 7]) == [1, 3, 5, 6, 7]
  assert sort_ascending([10, 2, 34, 22, 9, 1]) == [1, 2, 9, 10, 22, 34]
  assert sort_ascending([0, -1, -5, 3, 2]) == [-5, -1, 0, 2, 3]
output: def sort_ascending(arr):
      return sorted(arr)