#include <fstream>
using namespace std;

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

int n, a, b;

int euclid(int a, int b)
{
    int c = 0;
    while (b)
    {
        c = a % b;
        a = b;
        b = c;
    }
    return a;
}

int main()
{
    f >> n;
    for (int i = 1; i <= n; ++i)
    {
        f >> a >> b;
        g << euclid(a, b) << endl;
    }
    return 0;
}