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