#include <iostream>
#include <string>
#include <map>

using namespace std;

int main()
{
	map<string, int> stoi =
		{ { "help", 1 }, { "ring", 2 }, { "sink", 3 }, { "bye", 4 } };

	while(true) {
		// Red the command in.
		string in;
		cout << "> ";
		cin >> in;
		if(!cin) break;

		// Find the command.
		auto i = stoi.find(in);
		if(i == stoi.end()) {
			cout << "Unknown command " << in << endl;
			continue;
		}

		// Process known commands.
		switch(i->second)
		{
		case 1:
			cout << "Commands are help, ring, sink and bye."
			     << endl;
			break;
		case 2:
			cout << "Brrrriiinnnnng" << endl;
			break;
		case 3:
			cout << "Blub, blub, blub" << endl;
			break;
		case 4:
			exit(0);
		}
	}
}