import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
    
    Scanner sc = new Scanner(System.in);
      
      //入力
      int N = sc.nextInt();
      String S = sc.next();
      
      int count = 1;//1つは絶対スライムが存在する
      
      char[] slime = S.toCharArray();
      
      //初めにスライムの2番目と1番目を比べる
      for(int i =1; i<N; i++){
      		if(slime[i]!=slime[i-1]){
              	count +=1;//被っていなかったら
            }
      }
       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