import java.util.Scanner;

public class WeddingForumSolution {
    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        char sect = scan.nextLine().charAt(0);
        int rows = Integer.parseInt(scan.nextLine());
        int placesUncount = Integer.parseInt(scan.nextLine());
        int allPlaces = 0;


        for (char A = 'A'; A <= sect; A++) {

            for (int i = 1; i <= rows; i++) {

                if (i % 2 == 0) {

                    for (char a = 'a'; a < 97 + (placesUncount + 2); a++) {
                        allPlaces++;
                        System.out.printf("%S%d%s%n", A, i, a);
                    }

                } else {

                    for (char a = 'a'; a < 97 + placesUncount; a++) {
                        allPlaces++;
                        System.out.printf("%S%d%s%n", A, i, a);
                    }
                }
            }
            rows++;
        }
        System.out.println(allPlaces);

    }
}