#include <iostream>
#include <fstream>
using namespace std;

ifstream f("euclid2.in");
ofstream g("euclid2.out");
int main()
{
    int i, n, a, b;
    f >> n;
    for(i = 0;i < n;i++)
    {
        f >> a >> b;
        while(a != b)
        {
            if(a > b) a -= b;
            else b -= a;
        }
        g << a << endl;
    }


    return 0;
}