fn main() {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	let k: usize = s.trim().parse().unwrap();
	let n = ['N', 'U', 'P', 'C'];
	let mut a = Vec::new();
	for i in 0..16 {
		let mut s = String::new();
		for j in 0..4 {
			s.push(n[j]);
			if i >> j & 1 == 1 {
				s = s.repeat(2);
			}
		}
		a.push(s)
	}
	a.sort();
	println!("{}", a[k - 1])
}