using System;

using System.Collections.Generic;

​

public class Program

{

    public class CarCounting

    {

​

        public int Longest(string mySequence, char c = '\0')

        {

            int charCount = 0;

            for (int i = 0; i < mySequence.Length; i++)

            {

                char thisChar = mySequence[i];

                if (c != '\0' && thisChar != c) 

                    continue;

​

                int currentCount = 1;

                for (int j = i + 1; j < mySequence.Length; j++)

                {

                    char nextChar = mySequence[j];

                    if (thisChar != nextChar)

                        break;

                    currentCount++;

                }

​

                if (currentCount > charCount)

                {

                    charCount = currentCount;

                }

            }

​

            return charCount;

        }

    }

​

​

    static void Main(string[] args)

    {

​

        CarCounting newSequence = new CarCounting();

        Console.WriteLine(newSequence.Longest("CCMCCCCLLCCC", 'C')); //executes the function

​

    }

}