macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let mut s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

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

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

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

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

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

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

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

fn main() {
    input! {
        s: chars
    }
    let mut ans :isize= -1;
    let n = s.len();

    for (i, c) in s.iter().enumerate() {
        if 'c'.to_string()==c.to_string() && i<n{
           for (j, c) in s[i+1..].iter().enumerate(){
               if 'w'.to_string()==c.to_string() && i+j+1<n{
                   for (k, c) in s[i+j+2..].iter().enumerate(){
                           if 'w'.to_string()==c.to_string() && (ans==(-1 as isize)|| ((j+k+3) as isize)< ans){
                            ans=(j+k+3) as isize;
                        }
                    }
                }
            }
        }
    }
    println!("{}",ans);
}