#include <fstream>

using namespace std;

ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");

int CMMDC(int a,int b)
{
    int r;

    while(b)
    {
        r=a%b;
        a=b;
        b=r;

    }

    return a;
}


int main()
{

    int n,a,b;

    fin >> n;

    for(int i=1;i<=n;++i)
    {
    fin >> a >> b;
    fout << CMMDC(a,b) << endl;
    }




    return 0;
}