#include <fstream>

using namespace std;

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

int n, a, b, r;

int main(){

    fin >> n;
    for(int i = 1; i <= n; ++i){
        fin >> a >> b;
        while(b){
            r = a % b;
            a = b;
            b = r;
        }
        fout << a << '\n';
    }
    fin.close();
    fout.close();
    return 0;
}