import java.util.Scanner;
public class Main {
	public static void main(String args[]){//double 处理果盘
		Scanner in = new Scanner(System.in);
		int n = in.nextInt(),num = 0;
		String alph = in.next();
		char[] al = alph.toCharArray();
		for (int i=0 ;i<n ;i++){
			if (i == 0) {
				++num;
			}else{
				if(al[i] != al[i-1]){
					++num;
				}
			}
		}
		System.out.println(num);
	}
}
/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