Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If this card is discarded to the GY by card effect: Special Summon this card, then, if this card was discarded from your hand to your GY by an opponent's card effect, you can Special Summon 1 Fiend monster from your Deck to either field.
--暗黒界の鬼神 ケルト
--Lucent, Netherlord of Dark World
local s,id=GetID()
function s.initial_effect(c)
	--Special summon itself
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e1:SetCode(EVENT_TO_GRAVE)
	e1:SetCondition(s.spcon)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
end
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	e:SetLabel(e:GetHandler():GetPreviousControler())
	return e:GetHandler():IsPreviousLocation(LOCATION_HAND) and r&(REASON_DISCARD|REASON_EFFECT)==REASON_DISCARD|REASON_EFFECT
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,e:GetHandler(),1,0,0)
	if rp~=tp and tp==e:GetLabel() then
		Duel.SetPossibleOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_DECK)
	end
end
function s.filter(c,e,tp)
	return c:IsRace(RACE_FIEND)
		and ((Duel.GetLocationCount(tp,LOCATION_MZONE)>0 and c:IsCanBeSpecialSummoned(e,0,tp,false,false))
		or (Duel.GetLocationCount(1-tp,LOCATION_MZONE)>0 and c:IsCanBeSpecialSummoned(e,0,tp,false,false,POS_FACEUP,1-tp)))
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	if not e:GetHandler():IsRelateToEffect(e) then return end
	if Duel.SpecialSummon(e:GetHandler(),0,tp,tp,false,false,POS_FACEUP)==0 then return end
	if rp~=tp and tp==e:GetLabel() and Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_DECK,0,1,nil,e,tp)
		and Duel.SelectYesNo(tp,aux.Stringid(id,1)) then
		Duel.BreakEffect()
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
		local g=Duel.SelectMatchingCard(tp,s.filter,tp,LOCATION_DECK,0,1,1,nil,e,tp)
		local tc=g:GetFirst()
		if tc then
			local b1=Duel.GetLocationCount(tp,LOCATION_MZONE)>0 and tc:IsCanBeSpecialSummoned(e,0,tp,false,false)
			local b2=Duel.GetLocationCount(1-tp,LOCATION_MZONE)>0 and tc:IsCanBeSpecialSummoned(e,0,tp,false,false,POS_FACEUP,1-tp)
			local op=0
			if b1 and b2 then
				op=Duel.SelectOption(tp,aux.Stringid(id,2),aux.Stringid(id,3))
			elseif b1 then
				op=Duel.SelectOption(tp,aux.Stringid(id,2))
			elseif b2 then
				op=Duel.SelectOption(tp,aux.Stringid(id,3))+1
			else return end
			if op==0 then
				Duel.SpecialSummon(tc,0,tp,tp,false,false,POS_FACEUP)
			else
				Duel.SpecialSummon(tc,0,tp,1-tp,false,false,POS_FACEUP)
			end
		end
	end
end