#include <fstream>

using namespace std;

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

int t, a, b, r;

int main()
{
    f >> t;

    for (int i = 1; i <= t; i++)
    {
        f >> a >> b;
        while (b != 0)
        {
            r = a % b;
            a = b;
            b = r;
        }
        g << a << '\n';
    }

    f.close();
    g.close();

    return 0;
}