WeddingSeats

using System;

class WeddingSeats
{
    static void Main(string[] args)
    {
        char lastSector = char.Parse(Console.ReadLine());
        int rowsInSector = int.Parse(Console.ReadLine());
        int seatsInOddRows = int.Parse(Console.ReadLine());

        int seatsInEvenRows = seatsInOddRows + 2;

        int count = 0;
        for (char sector = 'A'; sector <= lastSector; sector++)
        {
            for (int row = 1; row <= rowsInSector; row++)
            {
                int seatsInCurrentRow;
                if (row % 2 != 0)
                {
                    seatsInCurrentRow = seatsInOddRows;
                }
                else
                {
                    seatsInCurrentRow = seatsInEvenRows;
                }

                for (char seat = 'a'; seat <= 'a' + seatsInCurrentRow - 1; seat++)
                {
                    Console.WriteLine($"{sector}{row}{seat}");
                    count++;
                }
            }

            rowsInSector++;
        }

        Console.WriteLine(count);
    }
}