#include <fstream>

using namespace std;
ifstream f ("euclid2.in");
ofstream g ("euclid2.out");
int n,i,a,b,r;
int main()
{
    f>>n;
    for(i=1; i<=n; i++)
    {
        f>>a>>b;
        r=a%b;
        while(r)
        {
            a=b;
            b=r;
            r=a%b;

        }

        g<<b<<'\n'
        ;
    }

    return 0;
}