import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.stream.Stream;

import static java.lang.System.in;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        String S = reader.readLine();
        int Ccounter = 0;
        int Wcounter = 0;
        for (int i = 0; i < S.length(); i++) {
            if (S.charAt(i) == 'c') {
                Ccounter += 1;
            } else {
                Wcounter += 1;
            }
        }
        if (Ccounter > Wcounter) {
            System.out.println(Wcounter);
        } else if (Ccounter < Wcounter) {
            System.out.println(Ccounter-1);
        } else {
            System.out.println(Ccounter-1);
        }
    }
}