#include <fstream>
 
using namespace std;
 
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
 
int main ()
{
    int a,b,n;
    fin>>n;
    for(;n;n--)
    {
        fin>>a>>b;
        while(a && b)
        {
            if(a>b)
                a%=b;
            else
                b%=a;
        }
        if(a>b)
            fout<<a<<"\n";
        else
            fout<<b<<"\n";
    }
}