#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int a,b,n,i;
int cmmdc(int a,int b)
{int r;
    while (b)
    {
        r=a%b;
        a=b;
        b=r;

    }
    return a;


}
int main()
{
    fin>>n;
    for (i=1;i<=n;i++)
        {
            fin>>a>>b;
            fout<<cmmdc(a,b)<<"\n";
        }

    return 0;
}