import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
        Scanner stdin = new Scanner(System.in);

        int N = stdin.nextInt();
        String S = stdin.next();
        String copy = S.substring(0,1);
        int cnt = 1;

        for(int i=1;i<S.length();i++) {
        	if(!(copy.equals(S.substring(i,i+1)))) {
        		copy =  S.substring(i,i+1);
        		cnt+=1;
        	}
        }
        System.out.println(cnt);
    }
}

/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