#include <stdafx.h>
#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int cmmdc(int a, int b)
{
	int rest;
	while (b)
	{
		rest = a % b;
		a = b;
		b = rest;
	}
	return a;
}
int main()
{
	int a, b, T;
	f >> T;

	for (int i = 1; i <= T; i++)
	{
		f >> a >> b;
		g << cmmdc(a, b) << endl;
	}

	return 0;
}