#include <iostream>
#include <fstream>

using namespace std;

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

int t;

int gcd(int a, int b)
{	if(!b) return a;
	return gcd(b, a % b);
}

int main()
{
	fin >> t;
	while(t--)
		{	int a, b;
			fin >> a >> b;
			fout << gcd(a, b) << '\n';
		}
	return 0;
}