#include <iostream>
#include <fstream>

using namespace std;

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

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

    int T;

    fin >> T;

    for (int i = 0; i < T; ++i) {
        int a, b;
        fin >> a >> b;

        fout << cmmdc(a, b) << '\n';
    }

    fin.close();
    fout.close();

    return 0;
}