kingsubin

import java.io.*;
 
public class boj_2941 {
    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    static String[] strs = {"c=", "c-", "dz=", "d-", "lj", "nj", "s=", "z="};
 
    public static void main(String[] args) throws IOException {
        String str = br.readLine();
        String s = str;
 
        for (int i = 0; i < 8; i++) {
            s = s.replaceAll(strs[i], "0");
        }
 
        System.out.println(s.length());
    }
 
}