#include <iostream>
#include <fstream>

using namespace std;

ifstream f("euclid2.in");
ofstream g("euclid2.out");

int n, x, y;

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

int main()
{
    f >> n;
    for (int i=0; i<n; i++)
    {
        f >> x >> y;
        g <<cmmdc(x,y)<<endl;
    }
    return 0;
}