input: Write a python function to sort each sublist and then sort the list of sublists by the length of the sublists.
  assert sortList([[3, 2, 1], [5, 4], [7]]) == [[7], [4, 5], [1, 2, 3]]
  assert sortList([[10, 8, 9], [2, 1], [6, 5, 4, 3]]) == [[1, 2], [8, 9, 10], [3, 4, 5, 6]]
  assert sortList([[0]]) == [[0]]
output: def sortList(lst):
      sorted_sublists = [sorted(sublist) for sublist in lst]
      sorted_sublists.sort(key=len)
      return sorted_sublists