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.Linq;
using System.Threading.Tasks;
using static System.Console;
using static System.Math;
class program{
  static void Main(string[] args){
    program p = new program();
    p.Run();
  }
  void Run(){
	int n=Readint()[0];
    string s = ReadLine();
    string now=s.Substring(0,1);
    int count=1;
    for (int i=1;i<s.Length;i++){
      if (now!=s.Substring(i,1)){
        count++;
        now=s.Substring(i,1);
      }
    }
    WriteLine(count.ToString());
  }

  int[] Readint(){
    string[] s = ReadLine().Split();
    int[] res=new int[s.Length];
    Parallel.For(0,s.Length,i=>{
      res[i]=int.Parse(s[i]);
    });
    return res;
  }
}