class Calc0088
  def initialize(args)
    args = args.map { |l| l.chomp.split(/\s+/) }
    @s = args.shift.first
    @bs = args.map(&:first)
  end

  def calc
    @bs.join.gsub('.', '').size.even?
  end

  def run
    calc ? @s : (@s == 'oda' ? 'yukiko' : 'oda')
  end
end

puts Calc0088.new(STDIN.readlines).run if __FILE__ == $0