func main()
	var S: []char :: cui@input()
	var num: int :: S = "oda" ?(1, 0)
	for(1, 8)
		var B: []char :: cui@input()
		do num :+ ^B.split(".").join("")
	end for
	do cui@print(num % 2 = 1 ?("oda\n", "yukiko\n"))
end func