#include <bits/stdc++.h>

using namespace std;

ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");

int t, a, b;

int main()
{
    fin >> t;

    for (int i = 1; i <= t; ++i) {
        fin >> a >> b;

        while (b != 0){
            int r = a % b;
            a = b;
            b = r;
        }

        fout << a << '\n';

    }
    return 0;
}