#include <fstream>

using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

int Euclid(int a, int b)
{
    int r;
    while(b)
    {
        r= a%b;
        a=b;
        b=r;
    }
    return a;
}

int main()
{
    int T;
    fin>>T;

    int a,b;
    while(T--)
    {
        fin>>a>>b;
        fout<<Euclid(a,b)<<'\n';
    }
    return 0;
}