#![allow(non_snake_case)]
#[allow(unused_imports)]
use proconio::{fastout, input, marker::*};

#[fastout]
fn main() {
    input! {
        N: usize,
        S: Chars,
    }

    let ans = (0..N - 1).filter(|&i| S[i] != S[i + 1]).count();
    println!("{}", ans + 1);
}