#include <fstream>
using namespace std;

ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");

int cmmdc(int a, int b)
{
    int r;
    while (b!=0)
    {
        r=a%b; a=b; b=r;
    }
    return a;
}

int main()
{
    int n, x, y;
    fin>>n;
    for (int i=1; i<=n; ++i)
    {
        fin>>x>>y;
        fout<<cmmdc(x, y)<<'\n';
    }
    return 0;
}