Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Each time a monster you control inflicts Battle Damage to your opponent, select 1 card from your opponent's Graveyard and return it to the bottom of their Deck.
--押し売りゾンビ
--Hard-sellin' Zombie
local s,id=GetID()
function s.initial_effect(c)
	--activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e1)
	--todeck
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_TODECK)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCode(EVENT_BATTLE_DAMAGE)
	e2:SetCondition(s.condition)
	e2:SetTarget(s.target)
	e2:SetOperation(s.operation)
	c:RegisterEffect(e2)
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return ep~=tp and eg:GetFirst():IsControler(tp)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_GRAVE) and chkc:IsControler(1-tp) and chkc:IsAbleToDeck() end
	if chk==0 then return true end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TODECK)
	local g=Duel.SelectTarget(tp,Card.IsAbleToDeck,tp,0,LOCATION_GRAVE,1,1,nil)
	if #g>0 then
		Duel.SetOperationInfo(0,CATEGORY_TODECK,g,1,0,0)
	end
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	if not e:GetHandler():IsRelateToEffect(e) then return end
	local tc=Duel.GetFirstTarget()
	if tc and tc:IsRelateToEffect(e) then
		Duel.SendtoDeck(tc,nil,SEQ_DECKBOTTOM,REASON_EFFECT)
	end
end