#include <fstream>

using namespace std;

ifstream f("euclid2.in");
ofstream g("euclid2.out");

int cmmdc(int a, int b)
{
    int r1 = (a > b) ? (a % b) : (b % a);
    while (r1)
    {
        a = b;
        b = r1;
        r1 = a % b;
    }
    return b;
}

int main()
{
    int a, b, t;
    f >> t;
    for (int i = 0; i < t; ++i)
    {
        f >> a >> b;
        g << cmmdc(a, b) << "\n";
    }
    f.close();
    g.close();
    return 0;
}