#include <iostream>
#include <fstream>

using namespace std;
int n,a,b,i;

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

int main ()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    f>>n;
    for (i=1;i<=n;i++)
        {
            f>>a>>b;
            g<<euclid(a,b)<<"\n";
        }
}