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