#include <fstream>
using namespace std;
int cmmdc(int a,int b)
{
    if(!b) return a;
    return cmmdc(b,a%b);
}
int main()
{
    ifstream f ("euclid2.in");
    ofstream g ("euclid2.out");
    int a,b,t;
    f>>t;
    while(t)
    {
        f>>a>>b;
        g<<cmmdc(a,b)<<endl;
        t--;
    }
        f.close();
        g.close();
        return 0;
}