#include <fstream>
using namespace std;

ifstream fin("euclid.in");
ofstream fout("euclid.out");

using namespace std;

int main()
{
    int t, a, b, r;
    fin >> t;
    for( int i = 1; i <= t; i++ )
    {
        fin >> a >> b;
        while(b != 0)
        {
            r = a % b;
            a = b;
            b = r;
        }
        fout << a << '\n';
    }
    fin.close();
    fout.close();
    return 0;
}