#include <iostream>
#include <fstream>

using namespace std;
ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");
int main()
{
    int t, a, b, r;
    fin >> t;
    for(int i = 1; i <= t; i++)
    {
        fin >> a >> b;
        while(b)
        {
            r = a % b;
            a = b;
            b = r;
        }
        fout << a << '\n';
    }
    return 0;
}