#include <iostream>
#include <fstream>

using namespace std;

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

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

int main() {
    int n, a, b;
    in >> n;
    for(int i = 1; i <= n; i++) {
        in >> a >> b;
        out << euclid(a, b) << "\n";
    }
    return 0;
}