#include <fstream>

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

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

    return a;
}

int main()
{
    int t;
    fin >> t;

    for(int i = 1; i <= t; i++)
    {
        int a, b;
        fin >> a >> b;

        fout << cmmdc(a, b) << '\n';
    }

    fin.close();
    fout.close();
    return 0;
}