#include<bits/stdc++.h>
using namespace std;
class Nguoi
{
	public:
		void Answer()
		{
			cout << "Hello, I'm a human!!" << endl;	
		}	
};
class Nusinh: public Nguoi
{
	public:
		void Answer()
		{
			cout << "Xin chao, em la co nu sinh may man!!" << endl;
		}
};
class Thaygiao: public Nguoi
{
	public:
		void Answer()
		{
			cout << "Thay giao so huong xin chao cac em!!" << endl;
		}
};
int main()
{
	Nguoi *ng1 = new Nusinh(); // Cap phat ng1 boi vung nho Nusinh
	Nguoi *ng2 = new Thaygiao(); // cap phat ng2 boi vung nho Thaygiao
	ng1->Answer();
	ng2->Answer();
	return 0;
}