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

int euclid(int x, int y)
{
    if(!y)
        return x;
        return  euclid(y, x%y);
}

int main()
{
    int n,a,b;
    f>>n;
    for(int i = 1; i <= n; i++)
    {
        f>>a>>b;
        g<<euclid(a,b)<<"\n";

    }
    return 0;
}