#include <fstream>

using namespace std;

int main()
{
    ifstream in("euclid2.in",ios::in);
    ofstream out("euclid2.out",ios::out);

    int T,a[10000],b[10000];

    in>>T;

    for(int i=0;i<T;++i)
    {
        in>>a[i];
        in>>b[i];
    }

    for(int i=0;i<T;++i)
    {
            int t;
    while (b[i] != 0)
    {
        t = b[i];
        b[i] = a[i] % b[i];
        a[i] = t;
    }


        out<<a[i];
        out<<"\n";
    }


return 0;






}