import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int size = sc.nextInt();
		sc.nextLine();
		char[] arr = sc.nextLine().toCharArray();
		int count = 0;
		char temp = arr[0];
		for(int i = 1;i<size;i++) {
			if(arr[i]!=temp) {
				count++;
				temp = arr[i];
			}
		}
		System.out.println(count+1);

	}

}

/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