#include <fstream>
using namespace std;
ifstream in ("euclid2.in");
ofstream out ("euclid2.out");
int cmmdc (int a ,int b)
{
    int r;
    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main ()
    {
        int n,a,b,i;
        in>>n;
        for (i=1; i<=n; i++)
        {
            in>>a>>b;
            out<<cmmdc(a,b)<<endl;

        }
        return 0;
    }