fn main() {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();

    let n_c = s.chars().filter(|&c| c == 'c').count();
    let n_w = s.chars().filter(|&c| c == 'w').count();

    println!("{}", (n_c - 1).min(n_w));
}