#include<fstream>

using namespace std;

int x, y, i, t;

int cmmdc (int a, int b)
{
    int r=0;
    while(b)
    {
        r = a%b;
        a = b;
        b = r;
    }
    return a;
}

int main()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    f >> t;
    for (i=1; i<=t; i++)
    {
        f >> x >> y;
        g << cmmdc (x,y) << "\n";
    }
    return 0;
}