#include <iostream>

class A
{
   public:
    A() { std::cout << "A()\n"; }
    explicit A(int a) { std::cout << "A(int)\n"; }
    ~A() { std::cout << "~A()\n"; }
};

class B
{
   public:
    B() { std::cout << "B()\n"; }
    explicit B(int a) { std::cout << "B(int)\n"; }
    ~B() { std::cout << "~B()\n"; }
};



class C : public A
{
    B b;
   public:
    C() { std::cout << "C()\n"; }
    explicit C(int a) : A(a), b(b) { std::cout << "C(int)\n"; }
    ~C() { std::cout << "~C()\n"; }
};

int main()
{
    C c;
    return 0;
}