def send_query(nums)
  STDOUT.puts(nums.join(' '))
  STDOUT.flush
  a, b = gets.chomp.split.map(&:to_i)
  [a, b]
end

counter = Hash.new(0)

10.times do |n|
  nums = [n] * 4
  a, _ = send_query(nums)

  counter[n] = a

  if a == 4
    exit 0
  end
end

nums = []

counter.each do |v, cnt|
  cnt.times do
    nums << v
  end
end

nums.permutation(4) do |list|
  a, b = send_query(list)

  break if a == 4
end