(define s (read-line))
(define count 0)
(define b (list))
(define (countc ls c n)
	(if (pair? ls)
		(begin
			(if (char=? (car ls) c)
				(set! n (+ n 1)))
			(countc (cdr ls) c n))
		n))
(let loop((i 8))
	(set! b (string->list (read-line)))
	(set! count (+ count (countc b #\b 0)))
	(set! count (+ count (countc b #\w 0)))
	(if (> i 1) (loop (- i 1))))
(if (= (modulo count 2) 0)
	(display s)
	(display (if (string=? s "oda") "yukiko" "oda")))