#include <fstream>

using namespace std;
ifstream f ("euclid2.in");
ofstream g ("euclid2.out");
int T,i,a,b,r;
int main()
{
   f>>T;
   for (i=1;i<=T;i++)
   {
       f>>a>>b;
       r=a%b;
       while (r>0)
       {
           a=b;
           b=r;
           r=a%b;
       }
       g<<b<<"\n";
   }
    return 0;
}