fn main() {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let s: Vec<char> = s.trim().chars().collect();

    let mut n_w_r = vec![0; s.len()];
    for i in (0..s.len() - 1).rev() {
        n_w_r[i] = n_w_r[i + 1]
            + match s.get(i + 1) {
                Some('w') => 1,
                _ => 0,
            };
    }

    let answer = s
        .iter()
        .enumerate()
        .filter(|&(_, &c)| c == 'c')
        .map(|(i, _)| n_w_r[i] * (n_w_r[i] - 1) / 2)
        .sum::<i64>();

    println!("{}", answer);
}