#include <fstream>

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