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

int func(int a, int b)
{
	int r;
	while (b != 0)
	{
		r = a % b;
		a = b;
		b = r;
	}

	return a;
}

int main()
{
	ifstream fin("euclid2.in");
	ofstream fout("euclid2.out");
	int T, a, b;
	fin >> T;

	for (int i = 1; i <= T; i++)
	{
		fin >> a >> b;
		fout << func(a, b) << endl;
	}

	fout.close();

	//system("pause");
	return 0;
}