#include <fstream>

using namespace std;

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

int euclid(int a, int b)
{
    int r = a%b;
    while(r)
    {
        a = b;
        b = r;
        r = a%b;
    }
    return b;
}

int main()
{
    int t;
    fin >> t;
    for(int i = 1; i <= t; i++)
    {
        int a, b;
        fin >> a >> b;
        fout << euclid(a, b) << '\n';
    }
    return 0;
}