#include <fstream>
using namespace std;

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

int main(){
	ifstream in("euclid2.in");
	ofstream out("euclid2.out");

	int t, a, b;
	in >> t;
	for (int i = 0; i < t; i++){
		in >> a >> b;
		out << euclid(a, b) << '\n';
	}

	in.close();
	out.close();

	return 0;
}