Hey here is my code in python 3!! All test cases passes with just tiny code below:

import sys N = int(input().strip()) C = input().strip() count=1 for i in range(len(C)-1):
if len(set(C))==1: break else: if C[i]!=C[i+1]: count+=1 print(count)

using System.CodeDom.Compiler; using System.Collections.Generic; using System.Collections; using System.ComponentModel; using System.Diagnostics.CodeAnalysis; using System.Globalization; using System.IO; using System.Linq; using System.Reflection; using System.Runtime.Serialization; using System.Text.RegularExpressions; using System.Text; using System;

class Solution {

static int StrokesToPaint(int N,string[] C)
{
   //C = new string[N];
   int count=1;


  for(int i=0; i<=(N-1); i++)
   {
      if(i!=4)
       {
           if(C[i] != C[i+1])
           {
               count = count+1;
           }               
        }           
   }

    return count;

}

static void Main(string[] args) {

     TextWriter textWriter = new StreamWriter(@System.Environment.GetEnvironmentVariable("OUTPUT_PATH"), true);

    int N = Convert.ToInt32(Console.ReadLine());

    //string[] C = new string[N];

   string[] C = Array.ConvertAll(Console.ReadLine().Split(' '), aTemp => 
   Convert.ToString(aTemp));      

    //string C = Console.ReadLine();       

    int count=StrokesToPaint(N,C);  

    //Console.WriteLine(count);

    textWriter.WriteLine(count);

    textWriter.Flush();
    textWriter.Close();  

}
    }

}

int main(){ int N; scanf("%d",&N); char a[N]; int count=0; scanf("%s",a);

for(int i=0;i<strlen(a);i++)
{
    if(a[i]!=a[i+1])
    count++;
}
printf("%d",count);
return 0;

}

public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    int N = in.nextInt();
    String C = in.next();

    char[] arr = new char[N];
    arr = C.toCharArray();
    int count = 1;
    for(int i=0; i<N-1; i++)
    {
        if(arr[i] != arr[i+1])
            count++;

    }
    System.out.println(count);
}