#!/usr/bin/env python
#coding:utf8

def read():
    return raw_input()


def work(s):
    wCnt = s.count('w')
    ans = 0
    
    for i in range(len(s)):
        if s[i] == 'c':
            ans += wCnt * (wCnt - 1) / 2
        elif s[i] == 'w':
            wCnt -= 1

    print ans


if __name__ == "__main__":
    work(read())