using System;

public class Program

{ static void interschimbare(ref int a , ref int b)

{int aux=new int();

 aux=a;

 a=b;

 b=aux;

}

    public static void Main()

    {int a,b;

     a=int.Parse(Console.ReadLine());

     b=int.Parse(Console.ReadLine());

     interschimbare(ref a,ref b);

        Console.WriteLine(a+" "+b);

    }

}