#include <fstream>
using namespace std;
ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");
int a, b, n, r, i;
int main()
{
    fin >> n;
    for (i=1; i<=n; i++) {
        fin >> a >> b;
        while (b>0) {
            r = a % b;
            a = b;
            b = r;
        }
        fout << a << '\n';
    }
    return 0;
}