import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		String buf = scanner.nextLine();
		int n = Integer.parseInt(buf);
		String s = scanner.nextLine();

		int count = 0;
		char last_char='\0';

		for(int i = 0; i < n; i++){
			char c = s.charAt(i);
			if(last_char != c) {
				count++;
				last_char= c;
			}
		}
		System.out.println(count);

		scanner.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