input: Write a function to sort an array in ascending order.
  assert sortAscending([2, 3, 5, 4, 1]) == [1, 2, 3, 4, 5]
  assert sortAscending([10, 7, 8, 9, 1, 5]) == [1, 5, 7, 8, 9, 10]
  assert sortAscending([3, 6, 2, 8, 7, 4]) == [2, 3, 4, 6, 7, 8]
output: def sortAscending(arr):
      return sorted(arr)