import java.util.*;
class Main {
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        String sra = sc.next();
      String wk = "";
        String pre = "";
        int ret = 0;
        for (int i =0;i<n;i++){
            wk = sra.substring(i,i+1);
            if(! wk.equals(pre)) ret ++;
            pre = wk;
        }
        System.out.println(ret);
        sc.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