input: Write a function to find the 2nd largest and the 3rd smallest number in a list.
  assert find_numbers([3, 5, 2, 4, 9, 7]) == (7, 4)
  assert find_numbers([10, 20, 30, 40, 50]) == (40, 30)
  assert find_numbers([1, 3, 5, 7, 9]) == (7, 5)
output: def find_numbers(lst):
      lst_sorted = sorted(lst)
      second_largest = lst_sorted[-2]
      third_smallest = lst_sorted[2]
      return (second_largest, third_smallest)