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

class Main {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        char[] c = sc.next().toCharArray();

        long[] wCnts = new long[c.length];
        if(c[c.length - 1] == 'w'){
            wCnts[wCnts.length - 1] = 1;
        }

        long sum = 0l;
        for (int i=c.length - 2; i>=0; i--) {

            if(c[i] == 'w'){
                wCnts[i] = wCnts[i+1] + 1; 
            }else if(c[i] == 'c'){
                long wCnt = wCnts[i+1];
                sum += (wCnt * (wCnt - 1)) / 2;
                wCnts[i] = wCnts[i+1];
            }else{
                wCnts[i] = wCnts[i+1];
            }
            
        }

        System.out.println(sum);
        
    }
}