#include <bits/stdc++.h>

using namespace std;

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

int main()
{
    int t, a, b, r;
    f >> t;
    while (t--)
    {
        f >> a >> b;
        while(b)
        {
            r = a % b;
            a = b;
            b = r;
        }
        g << a << '\n';
    }
    return 0;
}