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

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

int T, A, B;

int gcd(int a, int b)
{
    if (!b)
        return a;

    return gcd(b, a%b);
}

int main(void)
{


    fin>>T;

    for (; T; --T)
    {
        fin>>A>>B;
        fout<<gcd(A,B)<<endl;
    }

    return 0;
}