#include <iostream>
using namespace std;

class base {
public:
  base() { 
     cout << "Constructing base\n"; 
  }
  ~base() { 
     cout << "Destructing base\n"; 
  }
};

class derived1 : public base {
public:
  derived1() { 
     cout << "Constructing derived1\n"; 
  }
  ~derived1() { 
     cout << "Destructing derived1\n"; 
  }
};

class derived2: public derived1 {
public:
  derived2() { 
     cout << "Constructing derived2\n"; 
  }
  ~derived2() { 
     cout << "Destructing derived2\n"; 
  }
};

int main()
{
  derived2 ob;
  return 0;
}