# include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int n,i,a,b;
int cmmdc(int a,int b)
{
    if(!b)
       return a;
    return cmmdc(b,a%b);
}
int main()
{
    f>>n;
    for(i=1;i<=n;i++)
         {
          f>>a>>b;
          g<<cmmdc(a,b)<<'\n';
         }
    f.close();
    g.close();
    return 0;
}