#include <string>
#include <iostream>

using namespace std;

class Person 
{ 
    public: 
        string toString () {firstName + " " + lastName + " " + birthdate};
        
        friend ostream& operator<< (ostream& out, const Person& rhs);
}

ostream& operator<< (ostream& out, const Person& rhs)
{
    return (out << rhs.toString());
}