#include <iostream>
#include <fstream>



using namespace std;

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

int euclid(int a, int b)
{
       if(!b) return a;
       return euclid(b,a%b);
}

int main ()
{
    int a ,b ;
    int n;
    fin>>n;
    while (n)
    {
        fin>>a>>b;
        fout<<euclid(a,b)<<'\n';
        n--;
    }

}