input: 
  from typing import Tuple
  
  def swap_variables(x: int, y: int) -> Tuple[int, int]:
      """ Swaps the values of two integer variables.
      >>> swap_variables(5, 10)
      (10, 5)
      >>> swap_variables(0, -1)
      (-1, 0)
      """
  
output:     temp = x
      x = y
      y = temp
      return x, y