input: def swap_variables(x: int, y: int) -> None:
      """ Swaps the values of two variables.
      >>> swap_variables(5, 10)
      x: 10
      y: 5
      >>> swap_variables(3, 7)
      x: 7
      y: 3
      """
output:     temp = x
      x = y
      y = temp
      print(f"x: {x}")
      print(f"y: {y}")