#include <fstream>
#include <iostream>

using namespace std;

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

int T, a, b;

inline int euclid(int a, int b)
{
    if(b != 0)
        return euclid(b, a%b);
    else
        return a;
}

int main()
{
    fin >> T;
    while(T--)
    {
        fin >> a >> b;
        fout << euclid(a, b) << "\n";
    }
    fin.close();
    fout.close();
    return 0;
}