using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine(GenerateNextSequenceNumber("QAB-99999"));

        Console.WriteLine(GenerateNextSequenceNumber("QZB-99999"));

        Console.WriteLine(GenerateNextSequenceNumber("QAZ-99999"));

        Console.WriteLine(GenerateNextSequenceNumber("QZZ-99999"));

    }

​

    static string GenerateNextSequenceNumber(string quoteNumber)

    {

        var quoteSplit = quoteNumber.Split('-');

        if (quoteSplit.Count() !=2) throw new Exception();

        if(quoteSplit[1] != "99999")

        {

            return quoteSplit[0]+"-"+(Convert.ToInt32(quoteSplit[1])+1).ToString("D5");

        }

        else

        {

            if(quoteSplit[0][2] != 'Z')

            {

                return "Q"+quoteSplit[0][1]+((char)(Convert.ToInt32(quoteSplit[0][2])+1))+"-00001";

            }

            else

            {

                return "Q"+((char)(Convert.ToInt32(quoteSplit[0][1])+1))+"A-00001";

            }

        }

        return "0";

    }

}