WeddingSeats

import java.util.Scanner;

public class ExamNovember06WeddingSeats {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        char sector = scanner.nextLine().charAt(0);
        int sectorRows = Integer.parseInt(scanner.nextLine());
        int numbersSeatsOddRow = Integer.parseInt(scanner.nextLine());

        int count = 0;
        for (char i = 'A'; i <= sector; i++) {
            for (int j = 1; j <= sectorRows; j++) {
                if (j % 2 == 1) {
                    for (int k = 1; k <= numbersSeatsOddRow; k++) {
                        System.out.printf("%c%d%c\n", i, j, (char) k + 96);
                       count++;
                    }
                } else if (j % 2 == 0) {
                    for (int k = 1; k <= numbersSeatsOddRow + 2; k++) {
                        System.out.printf("%c%d%c\n", i, j, (char) k + 96);
                        count++;
                    }
                }
            }
            sectorRows++;
        }
        System.out.println(count);
    }
}