#include <fstream>

using namespace std;

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

int nrquiz, x, y;

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

int main()
{
    f>>nrquiz;
    while(nrquiz)
    {
        nrquiz--;
        f>>x>>y;
        g<<cmmdc(x,y)<<'\n';
    }
    return 0;
}