#include <fstream>

using namespace std;

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

int cmmdc(int a, int b)
{
    if (!b) return a;
    return cmmdc(b, a % b);
}

int main()
{
    int n, a, b;
    cin >> n;
    for(int i = 0; i < n; i++)
    {
        cin >> a >> b;
        cout << cmmdc(a, b) << endl;
    }
    return 0;
}