#include <cstdio>

int gcd(int a, int b) {
    int r;

    while (b) {
        r = a % b;
        a = b;
        b = r;
    }

    return a;
}

int main() {
    freopen("euclid2.in", "r", stdin);
    freopen("euclid2.out", "w", stdout);

    int t;
    int a, b;

    scanf("%d", &t);

    for (int i = 0; i < t; ++i) {
        scanf("%d %d", &a, &b);
        printf("%d\n", gcd(a, b));
    }
}