import java.util.*;
import java.math.*;
import java.lang.*;
import java.io.*;

public class Main{
  public static void main(String args[]) throws IOException{
    Scanner s=new Scanner(System.in);
    int n=s.nextInt();
    
    String ss=s.next();
    int c=1;
    for(int i=0;i<n-1;i++)
    {
      if(ss.charAt(i)!=ss.charAt(i+1))
        c++;
    }
   
    System.out.println(c);
  }
}
/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