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 (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>
int main(void) {
    long n, i, j, ans;
    char s[100001];
    scanf("%ld", &n);
    scanf("%s", s);

    j=0;
    ans=n;
    for (i=0; i<n-1; i++) {
        if (s[i] == s[i+1]) {
            j++;
        } else {
            if (j > 0) {
                ans -= j;
                j=0;
            }
        }
    }
    if (j > 0) {
        ans -= j;
    }
    
    printf("%ld", ans);
    return 0;
}