//20:32~
import java.util.*;

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

        Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
        String s = sc.next();

        char c = ' ';
        int count = 0;
        for(int i = 0; i < n; i++){
            if(c == s.charAt(i)){

            }else{
                c = s.charAt(i);
                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