Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When this card is destroyed by battle and sent to the Graveyard, place 2 A-Counters on the monster that destroyed it. (If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.)
--エーリアン・ウォリアー
--Alien Warrior
local s,id=GetID()
function s.initial_effect(c)
	--counter
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_COUNTER)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e1:SetCode(EVENT_BATTLE_DESTROYED)
	e1:SetCondition(s.ctcon)
	e1:SetOperation(s.ctop)
	c:RegisterEffect(e1)
	--atk def
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetCode(EFFECT_UPDATE_ATTACK)
	e2:SetRange(LOCATION_MZONE)
	e2:SetTargetRange(LOCATION_MZONE,LOCATION_MZONE)
	e2:SetCondition(s.adcon)
	e2:SetTarget(s.adtg)
	e2:SetValue(s.adval)
	c:RegisterEffect(e2)
	local e3=e2:Clone()
	e3:SetCode(EFFECT_UPDATE_DEFENSE)
	c:RegisterEffect(e3)
end
s.listed_series={SET_ALIEN}
s.counter_place_list={COUNTER_A}
function s.ctcon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():IsLocation(LOCATION_GRAVE) and e:GetHandler():IsReason(REASON_BATTLE)
end
function s.ctop(e,tp,eg,ep,ev,re,r,rp)
	local tc=e:GetHandler():GetReasonCard()
	if tc:IsFaceup() and tc:IsRelateToBattle() then
		tc:AddCounter(COUNTER_A,2)
	end
end
function s.adcon(e)
	return Duel.IsPhase(PHASE_DAMAGE_CAL) and Duel.GetAttackTarget()
end
function s.adtg(e,c)
	local bc=c:GetBattleTarget()
	return bc and c:GetCounter(COUNTER_A)~=0 and bc:IsSetCard(SET_ALIEN)
end
function s.adval(e,c)
	return c:GetCounter(COUNTER_A)*-300
end