fn g() -> Vec<char> {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	s.chars().collect()
}
fn main() {
	g();
	let s = g();
	let c = "aonw?";
	if !c.contains(s[0]) || !c.contains(s[1]) {
		println!("No");
		return;
	}
	for i in 1..s.len() - 1 {
		if !c.contains(s[i + 1]) {
			println!("No");
			return;
		}
		match (s[i - 1], s[i], s[i + 1]) {
			('w', '?', 'a') | ('w', '?', 'o') => {
				println!("No");
				return;
			}
			_ => {}
		}
	}
	println!("Yes")
}