#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");

int main() {
    int n, a, b;
    f >> n;
    for (int i = 0; i < n; i++)
    {
        f >> a >> b;
        while (a != b) {
            if (a > b) {
                a = a -b;
            }
            else {
                b =  b-a;
            }
        }
        g << a << endl;
    }
    
}