macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        let mut next = || { iter.next().unwrap() };
        input_inner!{next, $($r)*}
    };
    ($($r:tt)*) => {
        let stdin = std::io::stdin();
        let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock()));
        let mut next = move || -> String{
            bytes
                .by_ref()
                .map(|r|r.unwrap() as char)
                .skip_while(|c|c.is_whitespace())
                .take_while(|c|!c.is_whitespace())
                .collect()
        };
        input_inner!{next, $($r)*}
    };
}

macro_rules! input_inner {
    ($next:expr) => {};
    ($next:expr, ) => {};

    ($next:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };
}

macro_rules! read_value {
    ($next:expr, ( $($t:tt),* )) => {
        ( $(read_value!($next, $t)),* )
    };

    ($next:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
    };

    ($next:expr, chars) => {
        read_value!($next, String).chars().collect::<Vec<char>>()
    };

    ($next:expr, usize1) => {
        read_value!($next, usize) - 1
    };

    ($next:expr, $t:ty) => {
        $next().parse::<$t>().expect("Parse error")
    };
}

fn main() {
    input! {
        s: String,
    }

    let mut cww_len = -1;
    let chars: Vec<char> = s.chars().collect();
    for i in 0..chars.len() {
        if chars[i] == 'c' {
            let ww_len = get_ww_len(&chars, i);
            if ww_len != -1 && (cww_len == -1 || ww_len < cww_len) {
                cww_len = ww_len;
            }
        }
    }
    println!("{}", cww_len)
}

fn get_ww_len(chars: &Vec<char>, index: usize) -> isize {
    let mut count = 0;
    for i in index..chars.len() {
        if chars[i] == 'w' {
            count = count + 1;
        }
        if count == 2 {
            return (i - index + 1) as isize;
        }
    }
    return -1;
}