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

    ifstream fin("euclid2.in");
    ofstream fout("euclid2.out");
int t,a,b;

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

int main()
{
    fin>>t;
    for(;t;t--)
    {
        fin>>a>>b;
        fout<<euclid(a,b)<<'\n';
    }
    return 0;
}