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 (3.8.2) (judge verdict: Accepted)

N=int(input())
S=input()

while True:
    x=''
    ans=''
    for i in S:
       if (x==''):
        x=i
        continue
       if x!=i:
        #print("p:",x,i,ans)
        ans+=x
        x=i
        #print("a:",x,i,ans)

    ans+=x
    #print('ans:',ans)
    if ans==S:
        break
    else:
        S=ans
print(len(ans))