import java.util.Scanner;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;

class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String s = in.next();
        char[] c = s.toCharArray();

        int c_l = 0;
        int w_l = 0;
        for(int i=0; i<s.length(); i++) {
            if(c[i] == 'c') c_l++;
            if(c[i] == 'w') w_l++;
        }

        System.out.println(Math.min(c_l - 1, w_l));

        in.close();
    }
}