use std::cmp::min;

fn main() {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let s: &str = s.trim();
    let cc: usize = s.chars().filter(|c| *c == 'c').count();
    let wc: usize = s.len() - cc;

    println!("{}", min(if cc == 0 { 0 } else { cc - 1}, wc));
}