#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int n, a, b;

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

int main()
{
	fin >> n;
	for (int i = 1; i <= n; i++)
	{
		fin >> a >> b;
		fout << cmmdc(a, b)<<endl;
	}
	return 0;
}