Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If you control no monsters in your Main Monster Zone: Target 1 face-up monster on the field; destroy it, then, if you have 3 or more Spells in your GY, you can destroy 1 Spell/Trap on the field.
--閃刀術式－アフターバーナー
--Sky Striker Maneuver - Afterburners!
--Scripted by ahtelel
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_DESTROY)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.cfilter(c)
	return c:GetSequence()<5
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return not Duel.IsExistingMatchingCard(s.cfilter,tp,LOCATION_MZONE,0,1,nil)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsFaceup() end
	if chk==0 then return Duel.IsExistingTarget(Card.IsFaceup,tp,LOCATION_MZONE,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
	local g=Duel.SelectTarget(tp,Card.IsFaceup,tp,LOCATION_MZONE,LOCATION_MZONE,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,1,0,0)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) and Duel.Destroy(tc,REASON_EFFECT)>0 then
		local dg=Duel.GetMatchingGroup(Card.IsSpellTrap,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,e:GetHandler())
		if #dg>0 and Duel.GetMatchingGroupCount(Card.IsSpell,tp,LOCATION_GRAVE,0,nil)>=3 and Duel.SelectYesNo(tp,aux.Stringid(id,0)) then
			Duel.BreakEffect()
			Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
			local sg=dg:Select(tp,1,1,nil)
			Duel.HintSelection(sg)
			Duel.Destroy(sg,REASON_EFFECT)
		end
	end
end