#include <fstream>
using namespace std;
int main()
{
	fstream f("euclid2.in", ios::in);
	fstream g("euclid2.out", ios::out);
	int n, a, b, i;
	f >> n;
	for (i = 1; i <= n; i++)
	{
		f >> a >> b;
		while (a!=b)
		if (a > b)a = a - b;
		else b = b - a;
		g << a << endl;
	}
	f.close();
	g.close();
	return 0;
}