input: def find_shared_elements(l1: list, l2: list):
      """Return sorted list of unique elements that appear in both input lists.
      >>> find_shared_elements([1, 4, 3, 34, 653, 2, 5], [5, 7, 1, 5, 9, 653, 121])
      [1, 5, 653]
      >>> find_shared_elements([5, 3, 2, 8], [3, 2])
      [2, 3]
      
      """
output:     shared_elements = set(l1).intersection(l2)
      return sorted(shared_elements)