#include <fstream>
using namespace std;

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

int a, b, T;

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

int main()
{
    f >> T;
    for (int i = 1; i<=T; i++)
    {
        f >> a >> b;
        g << euclid(a, b) << '\n';
    }
}