#include <fstream>

using namespace std;

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

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

int main()
{
    int t, a, b;
    in >> t;
    for(int i = 0; i < t; i++)
    {
        in >> a >> b;
        out << cmmdc(a, b) << "\n";
    }
    return 0;
}