#include <fstream>

using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int n,a,b;
int cmmdc (int x, int y)
{
    while(y)
    {
        int r=x%y;
        x=y;
        y=r;
    }
    return x;
}
int main()
{
    fin>>n;
    for(int i=1; i<=n; ++i)
    {
        fin>>a>>b;
        fout<<cmmdc(a,b)<<'\n';
    }

    fin.close();
    fout.close();
    return 0;
}