input: 
  def sort_ascending(array):
      """ Sorts the input array in ascending order and returns the sorted array.
      >>> sort_ascending([10, 3, 9, 1, 15, 2])
      [1, 2, 3, 9, 10, 15]
      >>> sort_ascending([7, 4, 8, 2, 3, 1])
      [1, 2, 3, 4, 7, 8]
      """
      array.sort()
      return array
  
output:     return sorted(array)