#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int a,b,r,T,i;
int main()
{
    fin>>T;
    for(i=1;i<=T;i++)
    {
        fin>>a>>b;
        r=a%b;
        while(r!=0)
        {
            a=b;
            b=r;
            r=a%b;
        }
        fout<<b<<'\n';
    }
}