#include <fstream>
using namespace std;
ifstream  fin("euclid2.in");
ofstream fout("euclid2.out");
int T,i;
long long a,b,r;
int main()
{
    fin>>T;

    for(i=1; i<=T; i++)
    {
        fin>>a>>b;
        r=0;
        while(b!=0)
        {
            r=a%b;
            a=b;
            b=r;
        }

       fout<< a << "\n";
    }

    return 0;
}