/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    public static void main (String[] args) throws java.lang.Exception
    {
        // your code goes here
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String line = br.readLine();
        ArrayList<Long> w_num = new ArrayList<Long>();
        long w_cnt = 0;
        for(int i=line.length()-1;i>=0;i--){
            char c = line.charAt(i);
            if(c == 'c'){
                w_num.add(w_cnt);
            }else if(c == 'w'){
                w_cnt++;
            }
        }
        
        long ans = 0;
        for(long w:w_num){
            ans += combination(w);
        }
        System.out.println(ans);
        
    }
    
    public static long combination(long n){
        return (n * (n-1)) / 2;
    }
}