#include <fstream>

using namespace std;

int Cmmdc(int a, int b)
{
    int r;
    while(b!=0)
    {
        r = a % b ;
        a = b ;
        b = r ;
    }
    return a;
}
int main()
{
    int a,b,n,i;
    ifstream fin ("euclid2.in");
    ofstream fout ("euclid2.out");
    fin>>n;
    for(i=1;i<=n;i++)
    {
        fin>>a>>b;
        fout<<Cmmdc(a,b)<<"\n";
    }
    fout.close();
    return 0;
}