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