fn main() {
    let mut f = String::new();
    std::io::stdin().read_line(&mut f).ok();
    let mut oda: bool = f.trim() == "oda";
    for _ in 0..8 {
        let mut b = String::new();
        std::io::stdin().read_line(&mut b).ok();
        b.trim().chars().for_each(|c| {
            match c {
                '.' => {},
                _ => { oda = !oda; }
            }
        });
    }

    println!("{}", if oda { "oda" } else { "yukiko" });
}