input: 
  def swap_values(x: int, y: int) -> tuple:
      """Swaps the values of two variables and returns them as a tuple.
      >>> swap_values(5, 10)
      (10, 5)
      >>> swap_values(20, 30)
      (30, 20)
      """
      x, y = y, x
      return x, y
  
output:     x, y = y, x
      return x, y