import java.util.Scanner;

public class Main {


    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        long N = scanner.nextLong(); scanner.nextLine();
        String S = scanner.nextLine();

        long ans = 0;
        char prev = ',';
        for(int i = 0; i < S.length(); i++) {
            char cur = S.charAt(i);
            if(prev != cur) ans++;
            prev = cur;
        }
        System.out.println(ans);
    }
}

/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