#include <fstream>

using namespace std;
ifstream in ("euclid2.in");
ofstream out ("euclid2.out");
int euclid(int a,int b)
{
    int r;
    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    int t,a,b;
    in>>t;
    for(int i=1;i<=t;i++)
    {
        in>>a>>b;
        out<<euclid(a,b)<<'\n';
    }
    return 0;
}