fn main() {
    let mut input = String::new();
    let _ = std::io::stdin().read_line(&mut input);

    let input = input.chars().collect::<Vec<char>>();
    let mut pos = 0;
    let test = vec!['c', 'w', 'w'];
    let mut check = vec![];
    let mut min = -1;

    'start: for i in 0..input.len() {
        let mut test_index = 0;
        check.clear();
        'inner: for j in i..input.len() {
            if test[test_index] == input[j] {
                check.push(j);
                test_index += 1;
                if check.len() == test.len() {
                    if min == -1 {
                        min = (check[check.len()-1] + 1 - check[0]) as i32;
                    } else if ((check[check.len()-1] + 1 - check[0]) as i32) < min {
                        min = (check[check.len()-1] + 1 - check[0]) as i32;
                    }
                    break 'inner;
                }
            }
        }
    }

    println!("{}", min);
}