# A B の値を文字列で受け取る
a, b = gets.chomp.split

if a.to_i > (b.to_i * 60 * 60 / 1000)
    puts "KoD"
elsif a.to_i < (b.to_i * 60 * 60 / 1000)
    puts "blackyuki"
else
    puts "same"
end