#include<fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int cmmdc(int a, int b)
{
    int x,y;
    x=a;y=b;
    while(x!=y)
    {
        {if(x>y)x=x-y;
        else y=y-x;
        }
        return x;}
}
  int main ()


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

  fout.close();
  fin.close ();
  return 0;
}