#include <fstream>

using namespace std;

ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");

int n, a, b, r, i;

int main ()
{
    fin >> n;
    for (i=1; i<=n; i++)
    {
        fin >> a >> b;
        r = a%b;
        while (r!=0)
        {
            a = b;
            b = r;
            r = a%b;
        }
        fout << b << '\n';
    }
}