fn get_line() -> String {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().to_string()
}

fn main() {
    let mut c = 0;
    let mut w = 0;
    for &x in get_line().as_bytes() {
        if x == b'c' {
            c += 1;
        }
        else {
            w += 1;
        }
    }

    println!("{}",
        if c - 1 < w {
            c - 1
        }
        else {
            w
        }
    );
}