input: def sort_ascending(array):
      """Sorts the given array in ascending order.
      >>> sort_ascending([10, 3, 9, 1, 15, 2])
      [1, 2, 3, 9, 10, 15]
      """
      array.sort()
      return array
output:     for i in range(len(array)):
          for j in range(i + 1, len(array)):
              if array[i] > array[j]:
                  array[i], array[j] = array[j], array[i]