#include <fstream>

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

    }


 f.close();
 g.close();
    return 0;
}