input: Write a function to remove duplicates and sort a given list in ascending order. If the given list is empty, return an empty list.
  assert remove_duplicates_and_sort([2, 8, 5, 2, 6, 3, 4])==[2, 3, 4, 5, 6, 8]
  assert remove_duplicates_and_sort([1, 1, 2, 3, 3, 4, 4, 5])==[1, 2, 3, 4, 5]
  assert remove_duplicates_and_sort([])==[]
  assert remove_duplicates_and_sort([5, 4, 3, 2, 1])==[1, 2, 3, 4, 5]
  assert remove_duplicates_and_sort([10, 10, 10, 10])==[10]
output: def remove_duplicates_and_sort(lst):
      return sorted(set(lst))