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

a_km = a.to_i
b_km = b.to_i * 60 * 60 / 1000

if a_km > b_km
    puts "Kod"
elsif a_km < b_km
    puts "blackyuki"
else
    puts "same"
end