#include <fstream>

using namespace std;

int euclid (int a, int b)
{
    if (b == 0)
        return a;
    else
        return euclid (b, a%b);
}

int main()
{
    ifstream cin ("euclid2.in");
    ofstream cout ("euclid2.out");

    int n;
    cin >> n;

    int a, b;

    for (int i = 0; i < n; ++i)
    {
        cin >> a >> b;
        cout << euclid(a, b) << "\n";
    }

    return 0;
}