#include <iostream>
#include <fstream>

using namespace std;

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

int euclid(int a, int b)
{
    int r = a % b;
    while(r)
    {
        a = b;
        b = r;
        r = a % b;
    }
    return b;
}
int main()
{
    int t, a, b;
    fin>>t;

    for(int i = 1; i <= t; ++i)
    {
        fin>>a>>b;
        fout<<euclid(a, b)<<'\n';
    }
    return 0;
}