#include <iostream>
using namespace std;
class BASE
{
private:
char c;
public:
BASE(char n):c(n) {}
virtual ~BASE()
{
cout<<c;
}
};
class DERIVED:public BASE
{
private:
char c;
public:
DERIVED(char n):BASE(n+1),c(n) {}
~DERIVED()
{
cout<<c;
}
};
int main()
{
DERIVED d('X');
return 0;
}