#include <iostream>
#include <fstream>

using namespace std;
ifstream in("euclid2.in");
ofstream out("euclid2.out");

int main()
{
    int n,a,b;
    in >> n;
    for(int i=0;i<n;i++)
    {
        in >> a >> b;
        while(a!=b)
        {
            if(a>b)
                a-=b;
            else b-=a;
        }
        out << a <<endl;
    }
    return 0;
}