import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		String s = sc.next();
		int c_num = 0;
		int w_num = 0;
		for (int i=0; i<s.length(); i++) {
			if (s.charAt(i)=='c') {c_num++;}
			else {w_num++;}
		}
		
		if (c_num-1 >= w_num) {
			System.out.println(w_num);
		}
		else if (c_num-1 < w_num) {
			System.out.println(c_num-1);
		}
	}
}