#include <iostream>
#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int t, a, b;

int euclid(int a, int b)
{
    if(!b) return a;
    return euclid(b, a%b);
}

int main()
{
    f>>t;
    while(t)
    {
        f>>a>>b;
        g<<euclid(a,b)<<'\n';
        t--;
    }
    return 0;
}