input: def sort_ascending(nums):
      """
      This function takes a list of integers as input and sorts the list in ascending order.
  
      >>> sort_ascending([4, 2, 1, 3, 5])
      [1, 2, 3, 4, 5]
      >>> sort_ascending([9, 7, 2, 5, 3])
      [2, 3, 5, 7, 9]
      """
output:     nums.sort()
      return nums