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