/* HDU 2096 小明A+B --- 水题 */

#include <cstdio>

int main()

{

#ifdef _LOCAL

    freopen("D:\\input.txt", "r", stdin);

#endif

    int a, b, c, n;

    scanf("%d", &n);

    while (n--){

        scanf("%d%d", &a, &b);

        a %= ;

        b %= ;

        c = a + b;

        c %= ;

        printf("%d\n", c);

    }

    return ;

}