#include <iostream>
using namespace std;
 
class clsA {
public:
	clsA() { cout << "clsA\n"; }
	~clsA() { cout << "~clsA\n"; }
};
 
class dlvA : public clsA {
public:
	dlvA() { cout << "dlvA\n"; }
	~dlvA() { cout << "~dlvA\n"; }
};
 
class clsB {
public:
	clsB() { cout << "clsB\n"; }
	virtual ~clsB() { cout << "~clsB\n"; }
};
 
class dlvB : public clsB {
public:
	dlvB() { cout << "dlvB\n"; }
	~dlvB() { cout << "~dlvB\n"; }
};
 
 
int main() {
	{
		cout << "(1)\n";
		dlvA objA;
	}
	{
		cout << "(2)\n";
		dlvB objB;
	}
 
	cout << "(3)\n";
	clsA* ptrA = new dlvA;
	delete ptrA;
 
	cout << "(4)\n";
	clsB* ptrB = new dlvB;
	delete ptrB;
 
	return 0;
}

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