#include <fstream>
using namespace std;

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

int t, a, b;

int cmmdc(int a, int b)
{
    int r;
    while (b != 0)
    {
        r = a % b;
        a = b;
        b = r;
    }
    return a;
}

int main()
{
    in >> t;
    for (int i = 1; i <= t; i++)
    {
        in >> a >> b;
        out << cmmdc(a, b) << endl;
    }
    return 0;
}