#include <bits/stdc++.h>

using namespace std;

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

int main() {
    int t;
    fin >> t;
    for (int i = 0; i < t; i++) {
        int a, b;
        fin >> a >> b;
        while (b) {
            int r = a % b;
            a = b;
            b = r;
        }
        fout << a << '\n';
    }
    return 0;
}