#include<stdio.h>


int main(){
    int x,y,sum=0;
    scanf("%d",&x);
    scanf("%d",&y);
    if(x<0 && y<0){
        printf("Invalid input");
    
        return 0;
    }
    sum = x+y;
    printf("%d %d",sum);
    return 0;
    
    
}