#include <iostream>
using namespace std;
 
struct Command
{
	virtual void Exe()
	{ cout << "COMMAND" << endl; }
};
 
struct NewCommand : Command
{
	void Exe() final
	{ cout << "NEW" << endl; }
 
	void Xe() {cout << "EXTRA" << endl;}
};
 
int main() {
	// your code goes here
	Command cmd1;
	NewCommand cmd2;
 
	cmd1.Exe();
	cmd2.Exe();
	static_cast<Command>(cmd2).Exe();
	Command& cmd1p = cmd2;
	cmd1p.Exe();
	static_cast<NewCommand&>(cmd1p).Xe();
	return 0;
}

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