import java.util.*;

public class CodeKeeper {
	Vector list;
	String[] codes = {"alpha", "Lamda", "gamma", "delta", "zeta"};
	
	public CodeKeeper (String[] userCodes) {
		list = new Vector();
		//load built-in codes
		for (int i=0; i < codes.length; i++) {
			addCode(codes[i]);
		}
		
		//load user Codes
		for (int j=0; j < userCodes.length; j++) {
			addCode(userCodes[j]);
		}
		
		//display all codes
		for (Iterator ite=list.iterator(); ite.hasNext();) {
			String output = (String) ite.next();
			System.out.println(output);
		}
		
	}
	
	private void addCode(String code) {
		if (!list.contains(code)) {
			list.add(code);
		}
	}
	
	public static void main (String[] arguments) {
		CodeKeeper keeper = new CodeKeeper (arguments);
	}	
	
}