#include <fstream>
using namespace std;

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

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

    return a;
}
int main ()
{
    int i, a, b, T;
    f>>T;
    for (i=1; i<=T; i++)
    {
        f>>a>>b;
        g<<cmmdc(a, b)<<'\n';
    }
    return 0;
}