#include<iostream>
#include<algorithm>
using namespace std;

int main() {
    int T;
    cin >> T;
    while (T -- ) {
        int a, b;
        cin >> a >> b;
        while (b) {
            int c = a % b;
            a = b;
            b = c;
        }

        cout << a << endl;
    }
}