CGAL: how to store Plane parameters into a variables from CGAL Polyhedron object

I am trying to access the plane parameters from CGAL Polyhedron object. Well, I can see them in the console output but I like to store these plane parameters (A,B,C,D) into a variable or a vector for further processing.

Here is my C++ program:

#define _SCL_SECURE_NO_WARNINGS //to avoid compiler warning for C++ transform parameter

#include <iostream>
#include <vector>
#include <cmath>    
//CGAL header files
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polyhedron_3.h>
#include <algorithm>
using namespace std;

struct Plane_equation {
    template <class Facet>
    typename Facet::Plane_3 operator()(Facet& f) {
        typename Facet::Halfedge_handle h = f.halfedge();
        typedef typename Facet::Plane_3  Plane;
        return Plane(h->vertex()->point(),
            h->next()->vertex()->point(),
            h->next()->next()->vertex()->point());
    }
};

typedef CGAL::Exact_predicates_inexact_constructions_kernel      Kernel;
typedef Kernel::Point_3             Point_3;
typedef Kernel::Plane_3             Plane_3;
typedef CGAL::Polyhedron_3<Kernel>  Polyhedron;

int main()
{
    Point_3 p(-3, 4, 1);
    Point_3 q(0, 2, 5);
    Point_3 r(3, 6, -2);
    //Point_3 s(24, 4, 4); 
    Polyhedron P;
    P.make_triangle(p, q, r); //define triangle with points a,b,c 
    std::transform(P.facets_begin(), P.facets_end(), P.planes_begin(),
        Plane_equation());
    CGAL::set_pretty_mode(std::cout);
    std::copy(P.planes_begin(), P.planes_end(),
        std::ostream_iterator<Plane_3>(std::cout, "\n"));

    std::getchar();
    return 0;
}

The output plane parameters which I like to store into variables:

Plane_3(-2,33,18,-156)