dzied.rb

class Animal
  attr_accessor :name

  def say
    puts "Wrrrrr"
  end

  def sleep
    puts "Sleeeping"
  end
end

class Human < Animal
  attr_accessor :surname

  def say
    puts "Hello World"
  end
end

dog = Animal.new
me = Human.new

dog.say
dog.sleep

me.say
me.sleep