#include <fstream>
using namespace std;

int main()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");

    long t,i,a,b;
    f>>t;
    for (i=1;i<=t;i++)
       { f>>a>>b;
          while (a!=b)
           if (a>b) a=a-b;
           else b=b-a;
        g<<a<<"\n";
       }
        f.close();
        g.close();
        return 0;
}