import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        String input = new Scanner(System.in).next();
        int startIdx = -1;
        int answer = -1;
        CWWState cwwState = CWWState.C;

        for (int i = 0; i < input.length(); i++) {
            char c = input.charAt(i);
            switch (cwwState) {
                case C:
                    if (c == 'c') {
                        startIdx = i;
                        cwwState = CWWState.W1;
                    }
                    break;
                case W1:
                    if (c == 'w') {
                        cwwState = CWWState.W2;
                    }
                    break;
                case W2:
                    if (c == 'w') {
                        answer = i - startIdx + 1;
                        cwwState = CWWState.C;
                    }
                    break;
            }
        }
        System.out.println(answer);
    }

    private enum CWWState {
        C, W1, W2
    }
}