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