
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 Si = S.charAt(0);
   int count = 1;
   for(int i = 1;i<N;i++)
   {
     if(S.charAt(i)==Si) ;
     else 
     {
       count++;
       Si = S.charAt(i);
     }
   }
        	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