import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] arr = sc.next().toCharArray();
        int length = arr.length;
        int count = 0;
        for (char c : arr) {
            if (c == 'c') {
                count++;
            }
        }
        System.out.println(Math.min(count - 1, length - count));
    }
}