fn main() {
    proconio::input! {
        s: String,
    }
    let mut cww = s
        .chars()
        .filter_map(|c| match c {
            'c' => Some(0),
            'w' => Some(1),
            _ => None,
        })
        .collect::<Vec<_>>();
    for i in 1..cww.len() {
        if cww[i] != 0 {
            cww[i] = cww[i + 1..].iter().sum();
        }
    }
    let ans = cww
        .iter()
        .enumerate()
        .filter(|(_, c)| **c == 0)
        .map(|(i, _)| cww.iter().skip(i + 1).sum::<u64>())
        .sum::<u64>();
    println!("{ans}");
}