// in the name of GOD
#include <iostream>
#include <string>

class Base
{
public :
	Base(std::string name);
};
Base::Base(std::string name)
{
	std::cout<<"Hello "<<name;
}

class Child: public Base
{
public :
	Child(std::string username="defaultvalue");
};
Child::Child(std::string name):Base(name)
{}

int main()
{
	std::string name = "rukee";
	Child c(name);
	
}