private static char getMenuOption() {

		do {
			System.out.println("Enter option (A, R, T, L, U, S, C): ");
			String inputString = keyboard.next().toUpperCase();
			switch (inputString) {
			case "A":
			case "R":
			case "T":
			case "L":
			case "U":
			case "S":
			case "C":
				return (inputString.charAt(0));
			default:
				System.out.println("Invalid menu option. Please try again.");
				displayMenu();
				break;
			}
		} while (true);
	}