#include <iostream>
#include <fstream>

using namespace std;

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

int main()
{
    int a, b, n;

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

    fin >> n;

    for (int i = 0 ; i < n ; i++){
        fin >> a >> b;
        fout << euclid(a,b) << endl;
    }

    fin.close();
    fout.close();

    return 0;
}