input: Write a function to find the largest three numbers in a given list. If the list has less than three elements, return the largest numbers available.
  assert find_largest_three([1, 6, 3, 8, 7, 4])==[6, 7, 8]
  assert find_largest_three([10, 20])==[10, 20]
  assert find_largest_three([5, 5, 5, 5])==[5, 5, 5]
  assert find_largest_three([1])==[1]
  assert find_largest_three([])==[]
output: def find_largest_three(lst):
      if len(lst) == 0:
          return []
      sorted_lst = sorted(lst, reverse=True)
      return sorted_lst[:3]