import java.util.*;
public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt(),c=0;
		String s = sc.next();	
		n++;
		c++;
		for(int i = 1;i<s.length();i++){
			if(i-1==s.length()-1){
				break;
			}
			else if(s.charAt(i-1)!=s.charAt(i))
				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