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