#include <iostream>
#include <cstdlib>
#include <ctime>    //for the functions time and localtime
using namespace std;

int main()
{
        //Get the current hour of the day (0 to 23 inclusive).
        time_t t {time(nullptr)};
        tm *p {localtime(&t)};
        int hour {p->tm_hour};

	if (hour <  12) {
		cout << "Good morning."; 
	}
		else if (hour < 12 + 9) {
				cout << "Good evening.";
			} else {
				cout << "Good night.";
			}
	

	cout << "\n";
        return EXIT_SUCCESS;

}