Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If you control a "Bujin" monster: You can banish this card from your Graveyard, then target 1 face-up Attack Position monster your opponent controls; change it to face-up Defense Position, and if you do, its DEF becomes 0 until the end of this turn.
--武神器－イクタ
--Bujingi Boar
local s,id=GetID()
function s.initial_effect(c)
	--position
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_POSITION)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetRange(LOCATION_GRAVE)
	e1:SetCondition(s.poscon)
	e1:SetCost(Cost.SelfBanish)
	e1:SetTarget(s.postg)
	e1:SetOperation(s.posop)
	c:RegisterEffect(e1)
end
s.listed_series={SET_BUJIN}
function s.cfilter(c)
	return c:IsFaceup() and c:IsSetCard(SET_BUJIN)
end
function s.poscon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsExistingMatchingCard(s.cfilter,tp,LOCATION_MZONE,0,1,nil)
end
function s.filter(c)
	return c:IsPosition(POS_FACEUP_ATTACK)
end
function s.postg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(1-tp) and s.filter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.filter,tp,0,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_POSCHANGE)
	local g=Duel.SelectTarget(tp,s.filter,tp,0,LOCATION_MZONE,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_POSITION,g,1,0,0)
end
function s.posop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) and Duel.ChangePosition(tc,POS_FACEUP_DEFENSE)~=0 then
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_SET_DEFENSE_FINAL)
		e1:SetValue(0)
		e1:SetReset(RESETS_STANDARD_PHASE_END)
		tc:RegisterEffect(e1)
	end
end