class String
  def dlina_cm
    to_i
  end

  def xxxl
    10**self.length
  end

  def lineika
    chars.collect {|e| e.to_i}.inject(&:+)
  end
end

def manda(xuy = '113')
  (xuy.dlina_cm + 1).upto(xuy.xxxl) do |xuek|
    return xuek if xuy.lineika == xuek.to_s.lineika
  end
  "ne dam"
end

puts manda