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

ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int n,a,b;
int cmmdc(int a, int b)
{
    int r;
    while (b)
    {
        r = a%b;
        a=b;
        b=r;
    }
    return a;
}

int main()
{

    fin >> n;
    for (int i =0; i<n; ++i)
    {
        fin >> a >> b;
        fout << cmmdc(a,b) << "\n";
    }
    fin.close();
    fout.close();
    return 0;
}