#include <iostream>
#include <fstream>

using namespace std;

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

int main()
{
    int T,a,b;
    f>>T;
    for(int i=1;i<=T;i++)
    {
        f>>a;
        f>>b;
        while(a!=b)
            if(a>b)
                a=a-b;
            else
                b=b-a;
        g<<b<<endl;
    }
    f.close();
    g.close();
    return 0;
}