fn getline() -> String {
    let mut s = String::new();

    std::io::stdin().read_line(&mut s).ok();

    s.trim().to_string()
}

fn main() {
    let s = getline();

    let nc = s.chars().filter(|&c| c == 'c').count();
    let nw = s.len() - nc;

    println!("{}", if nc - 1 < nw {
        nc - 1
    } else {
        nw
    });
}