
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {
  public static void main(String args[]) {

    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    String S = sc.next();

    List<Character> list = new ArrayList<Character>();

    for (int i = 0; i < N; i++) {

      if (i == 0) {
        list.add(S.charAt(i));
        continue;
      }

      if (S.charAt(i) != S.charAt(i - 1)) {
        list.add(S.charAt(i));
      }
    }

    System.out.println(list.size());

    sc.close();
  }
}

/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