input: from typing import Tuple
  
  def swap_variables(x: int, y: int) -> Tuple[int, int]:
      """ Swap the values of two variables and return them as a tuple.
      >>> swap_variables(5, 10)
      (10, 5)
      >>> swap_variables(0, -1)
      (-1, 0)
      """
      x, y = y, x
      return x, y
output:     x, y = y, x
      return x, y