#include <fstream>

using namespace std;

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

int euclid(int a, int b)
{
	if (b == 0)
		return a;
	return euclid(b, a % b);
}

int main()
{
	int n,x,y;
	cin >> n;
	for (int i = 1; i <= n; i++)
	{
		cin >> x >> y;
		cout << euclid(x, y) << "\n";
	}
    return 0;
}