#include <fstream>

using namespace std;

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

int n, a, b;

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

int main()
{
    fin >> n;

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

    fin.close();
    fout.close();
    return 0;
}