#include <fstream>
using namespace std;

ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int cmmdc(int a, int b)
{
	while (b != 0)
	{
		int r = a%b;
		a = b;
		b = r;
	}
	return a;
}
int main()
{
	int n, a, b;
	fin >> n;
	for (int i = 1; i <= n; i++)
	{
		fin >> a >> b;
		fout << cmmdc(a, b) << '\n';
	}
}