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