#include <fstream>

using namespace std;

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

int euclid(int a, int b)
{
	int r = 1;
	while (r != 0)
	{
		r = a % b;
		a = b;
		b = r;
	}
	return a;
}

int main()
{
	int a, b, t;
	in >> t;
	while (t != 0)
	{
		in >> a >> b;
		out << euclid(a, b) << "\n";
		t--;
	}
}