#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;
}