# include <fstream.h>
 int t,a,b;
 int program(int a,int b)
  {
  if(!b)
     return a;
  return program(b, a%b);
  }
 int main()
  {
  ifstream fin("euclid2.in"); ofstream fout("euclid2.out");
  fin>>t;
  while(t)
      {
      t--;
      fin>>a>>b;
      fout<<program(a,b)<<'\n';
      }
  fin.close ();
  fout.close ();
  return 0;
  }