class Solve
  def initialize
    _ = gets.to_i
    @a_list = gets.chomp.split.map(&:to_i)
  end

  def run
    len = @a_list.size
    (len - 1).downto(3) do |i|
      if @a_list[i] != 0
        @a_list[i-2] += @a_list[i]
        @a_list[i] = 0
      end
    end

    puts get_ans_list[0]
    puts get_ans_list[1]
  end

  private

  def get_ans_list
    list = []
    3.downto(0) do |i|
      if (@a_list[i] != 0 && @a_list[i] != nil) || i == 0
        list << i
        list << @a_list[0..i].join(' ')
        break
      end
    end

    list
  end
end

Solve.new.run