#include <fstream>

using namespace std;

ifstream fin ( "euclid2.in" );
ofstream fout ( "euclid2.out" );

int main()
{   int n, i, a, b, r;
    fin >> n;
    for ( i = 1; i <= n; i++ )
         { fin >> a >> b;
           while ( b )
                  { r = a % b;
                    a = b;
                    b = r;
                  }
           fout << a << "\n";
         }
    fin.close();
    fout.close();
    return 0;
}