#include <bits/stdc++.h>

int gcd(int a, int b) {
    if(!b) {
        return a;
    }
    return gcd(b, a % b);
}

int main() {
    freopen("euclid2.in", "r", stdin);
    freopen("euclid2.out", "w",stdout);
    int t, a, b;
    scanf("%d", &t);
    for(int i = 0; i < t; i++) {
        scanf("%d %d", &a, &b);
        printf("%d\n", gcd(a, b));
    }
    return 0;
}