Have some fun and play hangman

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cctype>
#include <ctime>

using namespace std;

//use if supported, else comment it out
#define SYSTEM_CLS_SUPPORTED 


class GameWords{
private:
	std::vector<string> listOfWords;
public:
	GameWords(){_init();}
	string getNext(){ 	
		if(!listOfWords.empty()){
			string str = listOfWords.back();
			listOfWords.pop_back();
			return str;
		}
		return "";
	}	
	bool empty(){ return listOfWords.empty(); }
private:
        //LOOK AWAY THIS IS PRIVATE!!!
	void _init(){
		listOfWords.push_back("forbidden");     listOfWords.push_back("needle");
		listOfWords.push_back("guessing");      listOfWords.push_back("gossips");
		listOfWords.push_back("justifiable");   listOfWords.push_back("complains");
		listOfWords.push_back("whatsoever");    listOfWords.push_back("specimen");
		listOfWords.push_back("isothermic");    listOfWords.push_back("uncounted");
		listOfWords.push_back("dabbler");       listOfWords.push_back("quaternion");
		listOfWords.push_back("laminated");     listOfWords.push_back("overwise");
		listOfWords.push_back("unwarranted");   listOfWords.push_back("containing ");
		listOfWords.push_back("sleeveless");    listOfWords.push_back("sequence ");
		listOfWords.push_back("asterisks");     listOfWords.push_back("alphabetical");
		listOfWords.push_back("numerical ");    listOfWords.push_back("according");
		listOfWords.push_back("instantitations");listOfWords.push_back("template");
		
		std::random_shuffle(listOfWords.begin(),listOfWords.end());

	}
};
template<typename Type>
void print(const Type& arg,const string& endWith = ""){ 
	cout << arg;
	if(!endWith.empty())
		cout << endWith;	
}
void print(){
	print('\n');
}
template<typename Type>
Type getType(){
	Type var;
	while(!(cin >> var)){
		cin.clear();
		while(cin.get() != '\n') continue;
		print("\nError inputted, try to input again :");
	}
	return var;
}
void clearScreen(const size_t scale = 25){
	for(size_t i = 0; i < scale; ++i)
		print('\n');
}
int main()
{		
	srand(time(0));

	GameWords words; 
	const char EMPTY_CHAR = '*';
	bool isGameOver = false;	
	bool playAgain = true;
	
	while(playAgain && !words.empty())
	{
		string usedLetters;
		string winningWord = words.getNext();
		string accumulatedLetters(winningWord.size(),EMPTY_CHAR);

		while(!isGameOver)
		{
			print("\nMystery Word : " + accumulatedLetters);
			print("\nGuessed letters : " );
			std::copy(usedLetters.begin(),usedLetters.end(),std::ostream_iterator<char>(cout,","));
			print("\nGuess number : ");
			print(usedLetters.size(),"\n");			
			print();

			print("Enter a letter : ");
			char letter = getType<char>();		
			while(!isalpha(letter)){
				print("\nNot Valid character, try again : ");
				letter = getType<char>();
			}
			
			while(usedLetters.find_first_of(letter) != string::npos){
				print("\nLetter already entered, try again : ");
				letter = getType<char>();
			}
			
			usedLetters.push_back(letter);

			while(winningWord.find_first_of(letter) != string::npos){
				size_t pos = winningWord.find_first_of(letter);
				winningWord[pos] = EMPTY_CHAR;
				accumulatedLetters[pos] = letter;
			}
			if(winningWord.find_first_not_of(EMPTY_CHAR) == string::npos) {
				isGameOver = true;
				break;
			}
			
		}

		print("\n\n");
		print("\n\n");
		print("It took you ");
		print(usedLetters.size());
		print(" guesses to guess the correct answer : \"" + accumulatedLetters + "\"\n");

		print("\n\n");
		print("Play Again<y,n> : ");
		char ch = 0;
		while(ch != 'y' && ch != 'n'){
			print("\nInvalid input, try again  : ");
			ch = tolower(getType<char>());		
		}
		if(ch == 'y'){
			isGameOver = false;
			clearScreen();
		#if defined(SYSTEM_CLS_SUPPORTED)
			system("cls"); 
		#endif
		}
		else
			playAgain = false;
		
	}

	print("\n\nThanks 4 playin...and get you vocabs up...\n\n");
	return 0;
}