#include <iostream>
#include <fstream>
using namespace std;

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

int CMMDC(int a, int b);
int a, b, n;

int main()
{
	fin >> n;
	for (int i = 1; i <= n; ++i)
	{
		fin >> a >> b;
		fout << CMMDC(a, b) << '\n';
	}
	fin.close();
	fout.close();
	return 0;
}

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