#include <iostream>
#include <vector>
#include <string>

using namespace std;

class Registration {
    static vector<string> registered;
public:
    static void showRegistered() {
        for (int i = 0 ; i != registered.size() ; i++) {
            cout << registered[i] << endl;
        }
    }
    Registration(string name) {
        registered.push_back(name);
    }
};

class A {
    static Registration _registration;
};

class B {
    static Registration _registration;    
};

class C {
    static Registration _registration;    
};

vector<string> Registration::registered;

Registration A::_registration("quick");
Registration B::_registration("brown");
Registration C::_registration("fox");

int main() {
	Registration::showRegistered();
	return 0;
}