import java.util.Scanner;

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

    while (in.hasNext()) {
      int N = in.nextInt();
      char[] S = in.next().toCharArray();
      char currSlimeColor = S[0];
      int countRemain = 1;
      
      for (int i = 1; i < S.length; ++i) {
        if (S[i] != currSlimeColor) {
          ++countRemain;
          currSlimeColor = S[i];
        }
      }

      System.out.println(countRemain);
    }
  }
}
/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