C#

using System;
using System.Collections.Generic;
using System.Text;
 
namespace AutoNumber
{
    class Program
    {
        static int number = 0;
        static char[] characters = { 'A', 'A', 'A' };
 
        static void Main(string[] args)
        {
            for(int i = 0; i < 10000; i++)
            {
                Console.WriteLine(GenerateNumber());
            }
 
            Console.Read();
        }
 
        static string GenerateNumber()
        {
            number++;
 
            if(number > 9999)
            {
                number = 0;
 
                for(int i = characters.Length - 1; i >= 0; i--)
                {
                    if(characters[i] == 'Z')
                    {
                        characters[i] = 'A';
                    }
                    else
                    {
                        characters[i]++;
 
                        break;
                    }
                }
            }
 
            return new string(characters) + "-" + number.ToString();
        }
    }
}