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