import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long N = Long.parseLong(sc.nextLine());
        String S = sc.nextLine();
        sc.close();

        char baseChar = "*".toCharArray()[0];
        long count = 0;

        for (int i = 0; i < S.length(); i++) {
            char s = S.charAt(i);
            if (baseChar != s) {
                baseChar = s;
                count++;
            }
        }

        System.out.println(count);
    }

}
/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