fn main() {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	let (mut a, mut b) = (0, 0);
	for w in s.trim().split("yukicoder").skip(1) {
		if w.is_empty() {
			b += 1;
		} else {
			a = a.max(b + 1);
			b = 0;
		}
	}
	println!("{a}")
}