Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
At the end of the Damage Step, if this Defense Position card was attacked by a monster whose ATK is lower than this card's DEF: Destroy the attacking monster.
--針三千本
--Three Thousand Needles
local s,id=GetID()
function s.initial_effect(c)
	--destroy
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_DESTROY)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e1:SetCode(EVENT_DAMAGE_STEP_END)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	return Duel.GetAttackTarget()==c and ((c:IsOnField() and c:IsPosition(POS_DEFENSE)) or c:IsPreviousPosition(POS_DEFENSE))
		and Duel.GetAttacker():GetAttack()<c:GetDefense()
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,Duel.GetAttacker(),1,0,0)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local a=Duel.GetAttacker()
	if not a:IsRelateToBattle() then return end
	Duel.Destroy(a,REASON_EFFECT)
end