public static String stringCheck (String input, HashSet<String> dictionary){
		// This method makes sure user input is four letters, is in the dictionary HashSet, and is lower case, and informs user of specific errors 
		boolean error = false;
		if (input.length() != 4){
			System.out.println("Error: Your word is not four letters");
			error = true;
		}
		else if (!dictionary.contains(input)){
			System.out.println("Error: Your word is not in my dictionary");
			error = true;
		}
		if (error)
			return "ERROR";
		else
			return input.toLowerCase();
	}