#include<stdio.h>
void swap(int *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%d",x,y);
    return 0;
}