#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import itertools


def mykey(c):
    if c not in "cw":
        return "*"
    else:
        return c


def solve(s):
    answer = 0
    c_nums = []
    w_nums = []
    for k, g in itertools.groupby(s, mykey):
        if k == "c":
            c_nums.append(len("".join(g)))
        elif k == "w":
            if not c_nums:
                continue
            w_nums.append(len("".join(g)))
    for i, x in enumerate(c_nums):
        w = sum(w_nums[i:])
        answer += x * w * (w - 1) // 2
    return answer


if __name__ == '__main__':
    print(solve(input()))