import java.util.*;
import java.math.*;
import java.text.*;

public class Main {
    private static Scanner sc = new Scanner(System.in);
    public static void main(String[] args) throws Exception {
        String s = sc.next();
        int l = s.length();
        int[] ary = new int[l];
        
        int cnt = 0;
        for (int i = l-1;i >= 0;i--) {
            if (s.charAt(i) == 'w') cnt++;
            ary[i] = cnt;
        }
        
        long ret = 0;
        for (int i = 0;i < l;i++) {
            if (s.charAt(i) == 'c' && ary[i] >= 2) ret += comb((long)ary[i]);
        }
        
        System.out.println(ret);
    }
    
    private static long comb(long i) {
        return i * (i-1) / 2;
    }
}