Problem:
Score : 300 points

Problem Statement

There are N slimes lining up from left to right. The colors of these slimes will be given as a string S of length N consisting of lowercase English letters. The i-th slime from the left has the color that corresponds to the i-th character of S.

Adjacent slimes with the same color will fuse into one larger slime without changing the color. If there were a slime adjacent to this group of slimes before fusion, that slime is now adjacent to the new larger slime.

Ultimately, how many slimes will be there?

Constraints

1 \leq N \leq 10^5

|S| = N

S consists of lowercase English letters.

Input

Input is given from Standard Input in the following format:

N
S

Output

Print the final number of slimes.

Sample Input 1

10
aabbbbaaca

Sample Output 1

5

Ultimately, these slimes will fuse into abaca.

Sample Input 2

5
aaaaa

Sample Output 2

1

All the slimes will fuse into one.

Sample Input 3

20
xxzaffeeeeddfkkkkllq

Sample Output 3

10

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Slimes
{
    class Program
    {
        static void Main(string[] args)
        {
            int N = int.Parse(Console.ReadLine());
            string S = Console.ReadLine();

            Slime slime = new Slime();

            // 結果出力
            Console.WriteLine(slime.Count(N, S).ToString());
        }
    }

    class Slime
    {
        public int Count(int member, string colorlist)
        {
            string beforeMoji = "";
            int slimeCnt = 1;

            for (int cnt = 0; cnt < member; cnt++)
            {
                if (cnt == 0)
                {
                    beforeMoji = colorlist.Substring(cnt, 1);
                    continue;
                }

                if (beforeMoji != colorlist.Substring(cnt, 1))
                {
                    slimeCnt++;
                    beforeMoji = colorlist.Substring(cnt, 1);
                }
            }

            return slimeCnt;
        }
    }
}