Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When a face-up Attack Position monster(s) your opponent controls is changed to face-up Defense Position: Destroy all Defense Position monsters your opponent controls.
--断頭台の惨劇
--Tragedy
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:SetCode(EVENT_CHANGE_POS)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.cfilter(c,tp)
	return c:IsControler(tp) and c:IsPreviousPosition(POS_FACEUP_ATTACK) and c:IsPosition(POS_FACEUP_DEFENSE)
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return eg:IsExists(s.cfilter,1,nil,1-tp)
end
function s.filter(c)
	return c:IsDefensePos()
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.filter,tp,0,LOCATION_MZONE,1,nil) end
	local g=Duel.GetMatchingGroup(s.filter,tp,0,LOCATION_MZONE,nil)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,#g,0,0)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(s.filter,tp,0,LOCATION_MZONE,nil)
	if #g>0 then
		Duel.Destroy(g,REASON_EFFECT)
	end
end