import java.io.*;
import java.util.*;

public class Main {

    static long mod = (long) (1e9 + 7);

    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        int n = in.nextInt();
        String s = in.next();
        char[] c = s.toCharArray();
        char prev = Character.MIN_VALUE;
        int ans = 0;
        for (int i = 0; i < n; i++) {
            if (prev != c[i]) {
                ans++;
                prev = c[i];
            }
        }
        out.println(ans);
        out.close();
    }

    static long[][] powMat(long[][] a, long pow) {
        if (pow == 1) {
            return a;
        } else {
            if (pow % 2 == 0) {
                return powMat(mul(a, a), pow / 2);
            } else {
                return mul(a, powMat(mul(a, a), pow / 2));
            }
        }
    }

    static long[][] mul(long[][] a, long[][] b) {
        int n = a.length;
        long[][] c = new long[n][n];
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                for (int k = 0; k < n; k++) {
                    c[i][k] = (c[i][k] + (a[i][j] * b[j][k]) % mod) % mod;
                }
            }
        }
        return c;
    }

    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

        public double nextDouble() {
            return Double.parseDouble(next());
        }

        public long nextLong() {
            return Long.parseLong(next());
        }

    }
}
/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