#include <fstream>
using namespace std;

int n, a, b, r, i;

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

int main ()
{
    f>>n;

    for (i=1; i<=n; i++)
    {
        f>>a>>b;

        r=a%b;

        while (r!=0)
        {
            a=b;
            b=r;
            r=a%b;
        }

        g<<b<<'\n';

    }

    return 0;
}