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.Collections.Generic;
using System.IO;

public class Cell
{
    public int X { get; set; }
    public int Y { get; set; }
    public string CellType { get; set; }
    public int Step { get; set; }

    public static Cell[] GetCells(char[] row, int y)
    {
        var cells = Enumerable.Range(0, row.Length).Select(x => new Cell
        {
            X = x + 1,
            Y = y,
            CellType = Convert.ToString(row[x]),
            Step = -1,
        });
        return cells.ToArray();
    }

}


class Program
{
    public static long Read()
    {
        return long.Parse(Console.ReadLine());
    }

    public static long[] Reads()
    {
        return Console.ReadLine().Split().Select(long.Parse).ToArray();
    }

    public static void Main()
    {
        var sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
        Console.SetOut(sw);

        var n = Read();
        var s = Console.ReadLine();
        long count = 0;
        for(int i = 0; i < n-1; i++)
        {
            if (s[i] != s[i + 1])
                count++;
        }
        Console.WriteLine(count+1);



        Console.Out.Flush();
    }
}