/* 
 *     Author:  srtry
 *     Created: 2025-05-31T00:10:36+09:00
 *     Coding:  utf-8-unix
 */

use proconio::input;
use proconio::marker::{Chars};
use std::io::{stdout,Write,BufWriter};

fn main() {
    input!{
        s:Chars
    }

    let out = stdout();
    let mut out = BufWriter::new(out.lock());
    
    let mut w_cnt = 0;
    let mut ans:usize = 0;
    for &ch in s.iter().rev() {
        if ch=='c' && w_cnt>=2 {
            ans += w_cnt*(w_cnt-1)/2;
            continue;
        }
        if ch=='w' {
            w_cnt += 1;
        }
    }
    write!(out, "{}", ans).unwrap();
}