#define __EUCLID2__

#ifdef __EUCLID2__

#include <iostream>
#include <fstream>

int euclid(int a, int b) {
    if (a == b) {
        return a;
    }
    if (a < b) {
        return euclid(b, a);
    }
    return euclid(a - b, b);
}

int main() {
    std::ifstream fin("euclid2.in");
    std::ofstream fout("euclid2.out");

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

#endif