#include <fstream>

using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
long long t,i,a,b,r;
int main()
{
    f >> t;
    for(i = 1; i <= t; i++){
        f >> a >> b;
        r = a % b;
        while(r){
            a = b;
            b = r;
            r = a % b;
        }
        g << b << "\n";
    }
    return 0;
}