#include <iostream>
using namespace std;

class A
{
public:
    void showA()
    {
        cout << "Class A" << endl;
    }
};

class B : public A
{
public:
    void showB()
    {
        cout << "Class B" << endl;
    }
};

class C : public B
{
public:
    void showC()
    {
        cout << "Class C" << endl;
    }
};

int main()
{
    C c;
    c.showA();
    c.showB();
    c.showC();
    return 0;
}