#include <fstream>

using namespace std;

ifstream f ("euclid2.in");
ofstream g ("euclid2.out");

int euclid(int x, int y) {
    int t;
    while (x % y) {
        t = x % y;
        x = y;
        y = t;
    }
    return y;
}

int main() {
    int n, x, y;
    f >> n;

    for (int i = 1; i <= n; i++) {
        f >> x >> y;
        g << euclid(x, y) << '\n';
    }

    return 0;
}