import java.util.Scanner;

public class 크로아티아알파벳 {

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

        char[] word = sc.nextLine().toCharArray();
        int len = word.length;

        int wordCnt = 0;
        char prec;
        for (int i = len - 1; i >= 0; i--) {
            char c = word[i];

            switch (c) {
            case '=': // 4개
                prec = word[i - 1];
                if (prec == 'c') {
                    i--;
                } else if (prec == 'z') {
                    if (i - 2 >= 0 && word[i - 2] == 'd') {
                        i -= 2;
                    } else {
                        i--;
                    }
                } else if (prec == 's') {
                    i--;
                }
                wordCnt++;
                break;
            case '-': // 2개
                prec = word[i - 1];
                if (prec == 'c') {
                    i--;
                } else if (prec == 'd') {
                    i--;
                }
                wordCnt++;
                break;
            case 'j': // 2개
                prec = word[i - 1];
                if (prec == 'l') {
                    i--;
                } else if (prec == 'n') {
                    i--;
                }
                wordCnt++;
                break;
            default:
                wordCnt++;
                break;
            }

        }
        System.out.println(wordCnt);

        sc.close();
    }

}