#include<stdio.h>
int swap(int a,int b)
{
    int t=a;
    a=b;
    b=t;
}
int main()
{
    int x,y;
    scanf("%d",&x);
    scanf("%d",&y);
    if(x<0&&y<0)
    {
        printf("Invalid Input");
    }
    else
    {
        swap(x,y);
        printf("%d\n%d",&x,&y);
    }
    return 0;
}