name = gets.strip
count = 0
8.times do |x|
    str = gets
    str.length.times do |i|
        if str[i] == "b" || str[i] == "w"
            count += 1
        end
    end
end
if count % 2 == 0
    if name == "oda"
        puts "oda"
    else
        puts "yukiko"
    end
else
    if name == "oda"
        puts "yukiko"
    else
        puts "oda"
    end
end