import java.util.Arrays;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.PriorityQueue;
import java.util.Scanner;
import java.util.Set;
import java.util.TreeSet;

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

}