import java.util.*;
import java.util.regex.*;
public class A{
	public static void main(String args[]){
		Scanner sc=new Scanner(System.in);
		String s=sc.next();
		int c=a(s,"c");
		int w=a(s,"w");
		if(c>=w+1){
			System.out.print(w);
		}else{
			System.out.print(c-1);
		}
	}
		
	public static int a(String s,String c){
		int count=0;
		Pattern p = Pattern.compile(c);
 		Matcher m = p.matcher(s);
		while(m.find()){
			count++;
		}
		return count;
	}
}