#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
long n, a, b, r;
int main ()
{
    f >> n;
    for(int i = 1; i <= n; ++ i)
    {
        f >> a >> b;
        while(b != 0)
        {
            r = a-(a/b*b);
            a = b;
            b = r;
        }
        g << a << "\n";
    }
    return 0;
}