input: Write a function to remove duplicates from a given list and sort them in ascending order. The function should return the sorted list without duplicates.
  assert remove_duplicates_and_sort([2, 8, 5, 2, 6, 3, 4])==[2, 3, 4, 5, 6, 8]
  assert remove_duplicates_and_sort([9, 9, 1, 2, 3, 4, 4])==[1, 2, 3, 4, 9]
  assert remove_duplicates_and_sort([])==[]
  assert remove_duplicates_and_sort([5])==[5]
output: def remove_duplicates_and_sort(lst):
      return sorted(set(lst))