print((function (n)
	local p1 = io.stdin:read("*l")
	local p2 = p1 == "oda" and "yukiko" or "oda"
	local m = n*n
	for i=1,n do io.stdin:read("*l"):gsub("%.", function (e) m=m-1 end) end
	return bit.band(m,1) == 0 and p1 or p2
end)(8))