#include<stdio.h>
void func(int *num1,int *num2){
    *num1=(*num1+*num2)-(*num2=num1);
    printf("%d",num1);
    printf("%d",num2);
}
int main(){
    int n1,n2;
    scanf("%d",&n1);
    scanf("%d",&n2);
    if(n1<0 || n2<0){
        printf("Invalid Input");
    }
    func(&n1,&n2);
    return 0;
}