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