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();  

       int i ;
       int m = 0 ;

       String[]  stringArray;        
       stringArray= new  String[N];

       for(i = 1 ; i <= N ; i++) {

             stringArray[i-1]  = S.substring(i-1, i);
      //    System.out.println(stringArray[i-1]);
       }
    
       for(i = 1 ; i < N ; i++) {

             if  (stringArray[i-1].equals(stringArray[i] ) )  {
            
             } else  {
               m = m + 1;
             }

       }
     if (N > 0 ) {  
          System.out.println(m+1);
           }
     }

} 

/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