import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		try(Scanner sc = new Scanner(System.in)){
			int N = sc.nextInt();
			char[] S = sc.next().toCharArray();
			int c = 0;
			char prev = 'A';
			for(int i = 0; i < N; i++) {
				if(S[i] != prev) {
					c++;
					prev = S[i];
				}
			}
			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