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