import java.util.*;
 
public class Main {
	public static void main(String[] args) {
 
		Scanner sc  = new Scanner(System.in);

		int o = 0 ,p = 0,q = 0;
		long a = 0, b = 0, c = 0;
		char ch;
		String str;
		
        String s1 = sc.next();
        char[] c1 = s1.toCharArray();
        
        for(int i = 0; i < s1.length(); i++ ){
             if( c1[i]=='c' ) p++;
            if( c1[i]=='w' ) q++;
        
        }
        
        if(p<2 || q < 1) System.out.print("0");
        else if(p>=q)    System.out.print(q);
        else if(q>p)     System.out.print(p-1);
 

              

        System.out.println();
	}
}