#include <iostream>
#include <fstream>

using namespace std;

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

int euclid(int a, int b)

{

    int c;

    while (b) {

        c = a % b;

        a = b;

        b = c;

    }

    return a;

}

int main()
{

    int T, a, b;
    fin >> T;
        while(T)
        {
          fin >>a; fin>>b;
          fout << euclid(a, b)<<endl;
          T--;
        }


    return 0;
}