class A
  def initialize
    s = gets.chomp
    b = 0

    8.times do
      b += gets.chomp.count('bw')
    end

    if b.even?
      puts (s == 'oda')? 'oda' : 'yukiko'
    else
      puts (s == 'oda')? 'yukiko' : 'oda'
    end
  end
end

A.new