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 Python (3.4.3) (judge verdict: Accepted)

import sys
input = sys.stdin.readline


# ランレングス化 (ex. "RLL.." => [['R',1],['L',2],..]
def runLength(s):
    a = []
    for c in s:
        if len(a) == 0 or a[-1][0] != c:
            a.append([c, 1])
        else:
            a[-1][1] += 1
    return a


def main():
    _ = int(input())
    S = input().strip()
    print(len(runLength(S)))


if __name__ == '__main__':
    main()