#include <iostream>
#include <fstream>

using namespace std;

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

int cmmdc(int a, int b) {
    if (b == 0) return a;
    return cmmdc(b, a % b);
}

int a, b, r, n;

int main() {
    fin >> n;
    for (; n; n--) {
        fin >> a >> b;
        fout << cmmdc(a, b) << "\n";
    }

    return 0;
}