#include <stdio.h>

int num1,num2;


int swap(num1,num2)
    num1=(num1+num2)-(num2=num1);

int main(){
    
    if(num1<0 || num2<0){
        printf("Invalid Input");
        return 0;
    }
    swap(num1,num2);
    scanf("%d\n%d",&num1,&num2);
    printf("%d\n%d",num1,num2);
    return 0;
}