#include <fstream>

using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
long x,y,n;
long CMMDC(long a, long b)
{

    long t;
    while (b != 0)
    {
        t = b;
        b = a % b;
        a = t;
    }
    return a;


}
int main()
{
    f>>n;
       for(int i=0; i<n; i++)
           f>>x>>y,g << CMMDC(x,y) << endl;
    return 0;
}