#include <fstream>
using namespace std;

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

int n;

int cmmdc(int a, int b)
{
    if(b==0)return a;
    else return cmmdc(b, a%b);
}

int main()
{
    fin>>n;
    for(int i=0;i<n;++i)
    {
        int a, b;
        fin>>a>>b;
        fout<<cmmdc(a, b)<<'\n';
    }
    return 0;
}