input: 
  def swap_variables(x: int, y: int) -> None:
      """ Swap the values of two variables x and y.
      >>> x, y = 5, 10
      >>> swap_variables(x, y)
      x: 10
      y: 5
      """
  
output:     temp = x
      x = y
      y = temp
      print(f"x: {x}")
      print(f"y: {y}")