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: Wrong Answer)

import sys
from itertools import accumulate
input = sys.stdin.readline
def inputs():return [int(x) for x in input().split()]
N = int(input())
S= list(input())
s = []
cnt= 1
for i in range(len(S)-1):
  if S[i]==S[i+1]:
    cnt+=1
  else:
    s.append(cnt)
    cnt=1
s.append(cnt)
print(len(s))