use std::io::{self, BufRead};

fn get_lines() -> Vec<String> {
    let stdin = io::stdin();
    let lines: Vec<String> = stdin.lock().lines().map(|l| l.unwrap()).collect();
    return lines;
}

fn main(){
    let s = &get_lines()[0];
    let l = s.len();
    let mut i = 0;
    for c in s.chars().rev() {
        if c == 'c' {
            if l / 2 > i {
                println!("{}", i);
            } else {
                println!("{}", l - i - 1);
            }
            return;
        }
        i += 1;
    }
}