import java.util.Scanner;

public class PlaneSeating {
    private final Scanner input = new Scanner(System.in);
    private final char[][] rows = {{'A', 'B', 'C'}, {'A', 'B', 'C'}, {'A', 'B', 'C'}};

    public void run() {
        while (true) {
            System.out.print("\nMenu\n1. Select Seat\n2. Print Seating Chart\n3. Exit\n");
            System.out.print("Choice: ");

            switch (readInput(1, 3)) {
                case 1:
                    selectSeat();
                    break;
                case 2:
                    printSeating();
                    break;
                case 3:
                    return;
            }
        }
    }

    private int readInput(int from, int to) {
        while (true) {
            String choice = input.nextLine();

            if(choice.matches("[A-Za-z]")) {
                int i = Character.toLowerCase(choice.charAt(0)) - 'a';
                if (i >= from && i <= to) {
                    return i;
                }
            } else if (choice.matches("[0-9]+")) {
                int i = Integer.parseInt(choice);
                if (i >= from && i <= to) {
                    return i;
                }
            }

            System.out.print("Sorry, invalid option, try again\n");
        }
    }

    public void selectSeat() {
        System.out.print("Select Row(1, 2, 3): ");
        int row = readInput(1, rows.length) - 1;
        System.out.print("Select Seat(A, B, C): ");
        int seat = readInput(0, 2);

        rows[row][seat] = 'X';
    }

    public void printSeating() {
        for (int r = 0; r < rows.length; r++) {
            for (int s = 0; s < rows[r].length; s++) {
                System.out.print(rows[r][s] + " ");
            }
            System.out.println();
        }
    }

    public static void main(String[] args) {
        new PlaneSeating().run();
    }
}