#include <bits/stdc++.h>

using namespace std;

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

int main()
{
    int t;
    fin >> t;
    for (int i = 0; i < t; i++)
    {
	int a, b;
	fin >> a >> b;
	while (b)
	{
	    int r = a % b;
	    a = b;
	    b = r;
	}

	fout << a << '\n';
    }
    return 0;
}