#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)
{
    if (!b) return a;
    return cmmdc(b, a % b);
}

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