aaaicu

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String input = scan.nextLine();
		String [] replaceStr = {"c=", "c-", "dz=", "d-", "lj", "nj","s=","z="};

		for(String str : replaceStr) {			
			input = input.replace(str,"a");
		}
		System.out.println(input.length());
		scan.close();
	}
}