#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int euclid(int a, int b)
{
    if(b==0)
        return a;
    else
        return euclid(b,a%b);
}
int main()
{
    int t, a, b;
    f>>t;
    while(t!=0)
    {
        f>>a>>b;
        g<<euclid(a,b)<<endl;
        t--;
    }
    f.close(); g.close();

    return 0;
}