#include <iostream>
#include <fstream>

using namespace std;

int cmmdc(int a, int b)
{
    int r;

    while(b != 0)
    {
        r = a % b;
        a = b;
        b = r;
    }

    return a;
}

int main()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    int t, a, b, i;

    f >> t;

    for(i=1; i<=t; i++)
    {
        f >> a >> b;
        g << cmmdc(a, b) << endl;
    }

    f.close();
    g.close();
    return 0;
}