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