#include <iostream>
#include <fstream>

using namespace std;

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

int euclid(int a, int b) {
    int c;

    while (b) {
        c = a % b;
        a = b;
        b = c;
    }

    return a;
}

int main() {

    int t;
    fin >> t;

    for (int i = 1; i <= t; ++i) {
        int a, b;
        fin >> a >> b;
        fout << euclid(a, b) << "\n";
    }

    return 0;
}