#include <iostream>
#include <fstream>

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

int main()
{
    int t, a, b, r;

    fin>>t;
    for(int i = 1; i <= t; i++)
    {
        fin>>a>>b;
        while(a!=b)
        {
            if(a>b) a = a - b;
            else b = b - a;
        }
        fout<<a<<endl;
    }
}