import java.util.Scanner;
public class Main {
  public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    int N = scan.nextInt();
    String A = scan.next();
    int ans = 1;
    for (int i = 0 ; i < N - 1 ; i++) {
      if (!A.substring(i, i+1).equals(A.substring(i+1, i+2))){
        ans += 1;
      }
    }
    System.out.println(ans);
    scan.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