#include <fstream>
using namespace std;
unsigned long long euclid(unsigned long long x, unsigned long long y)
{
    unsigned long long r;
    if(x>y)
    {
        r=x%y;
        while(r>=1)
        {
            x=y;
            y=r;
            r=x%y;
        }
        return y;
    }
    else
    {
        r=y%x;
        while(r>=1)
        {
            y=x;
            x=r;
            r=y%x;
        }
        return x;
    }
}
int main()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    unsigned long long n,x,y;
    f>>n;
    for(unsigned long long i=1;i<=n;++i)
    {
        f>>x>>y;
        g<<euclid(x,y)<<'\n';
    }
    f.close();
    g.close();
    return 0;
}