using System;

public class Program

{

    public static void Main()

    {

        var res = RemoveConsecutiveCharacters("aaaaappppptttttsddd", 2);

        Console.WriteLine("Result " + res);

    }

    private static string RemoveConsecutiveCharacters(string s, int n)

    {

        int counter = 1;

        string res = s[0].ToString();

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

        {

            if(s[i-1] >=0)

            {

                if(s[i-1] != s[i]) 

                {

                    res += s[i].ToString();

                    counter = 1;

                }

                else

                {

                    if(counter < n)

                    {

                        res += s[i].ToString();

                        counter++;

                    }

                }

            }

        }

        return res.ToString();

    }

}