import java.util.Scanner;

public class Main {
    static Scanner sc;
    public static void main(String[] args) {
        sc = new Scanner(System.in);
        int N = sc.nextInt();
        String S = sc.next();

        char c = S.charAt(0);
        int l = 1;
        for(int i = 1; i < N; i++) {
           if(S.charAt(i) != c) {
               l += 1;
               c = S.charAt(i);
           }
        }

        System.out.println(l);

    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz