use std::io::Read;

fn main() {
	let mut s = String::new();
	std::io::stdin().read_to_string(&mut s).ok();
	let mut itr = s.trim().split_whitespace();
	let s = itr.next().unwrap();
	let mut cnt = itr.flat_map(|e| e.chars()).filter(|&c| c != '.').count();
	match (s, cnt % 2) {
		("oda", 0) => println!("oda"),
		("yukiko", 1) => println!("oda"),
		(_, _) => println!("yukiko"),
	};
}