#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int main()
{
    int n, a, b;
    fin >> n;
    for (int i = 1; i <= n; i++)
    {
        fin >> a >> b;
        while (a != b)
        {
            if (a > b)
                a -= b;
            else
                b -= a;
        }
        fout << a << "\n";
    }
}