#include <fstream>
using namespace std;
ifstream in("euclid2.in");
ofstream out("euclid2.out");
int euclid (int a, int b)
{
        int c;
        while (b)
        {
                c=a%b;
                a=b;
                b=c;
        }
        return a;
}
int main()
{
    int t,a,b,i;
    in>>t;
    for (i=1;i<=t;i++)
    {
            in>>a>>b;
            out<<euclid(a,b)<<"\n";
    }
    in.close();
    out.close();
    return 0;
}