#include <fstream>

using namespace std;

ifstream cin("euclid2.in");
ofstream cout("euclid2.out");

int cmmdc(int a, int b) {
    int r = a % b;
    while (r > 0) {
        a = b;
        b = r;
        r = a % b;
    }
    return b;
}

int main() {
    int t;
    cin >> t;
    while (t--) {
        int a, b;
        cin >> a >> b;
        cout << cmmdc(a, b) << '\n';
    }
    return 0;
}