import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
       Scanner sc = new Scanner(System.in);
 
		int n = Integer.parseInt(sc.next());
		String s = sc.next();
	int cnt = 1;
	
	if(n > 1){
    	for(int i=1; i<n; i++){
	        if(s.charAt(i) != s.charAt(i-1)){
	            cnt++;
	        }
	    }
	}
	
		System.out.println(cnt);
		sc.close();
    }
}
/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