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