Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Activate only while you control a face-up Level 7 or higher monster. Destroy all face-up Level 5 or lower monsters your opponent controls. Monsters you control cannot attack this turn.
--無力の証明
--Proof of Powerlessness
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_FREE_CHAIN)
	e1:SetHintTiming(0,TIMINGS_CHECK_MONSTER)
	e1:SetCondition(s.condition)
	e1:SetCost(s.cost)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsLevelAbove,7),tp,LOCATION_MZONE,0,1,nil)
end
function s.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetActivityCount(tp,ACTIVITY_ATTACK)==0 end
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_CANNOT_ATTACK_ANNOUNCE)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET+EFFECT_FLAG_OATH)
	e1:SetTargetRange(1,0)
	e1:SetReset(RESET_PHASE|PHASE_END)
	Duel.RegisterEffect(e1,tp)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsLevelBelow,5),tp,0,LOCATION_MZONE,1,nil) end
	local sg=Duel.GetMatchingGroup(aux.FaceupFilter(Card.IsLevelBelow,5),tp,0,LOCATION_MZONE,nil)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,sg,#sg,0,0)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local sg=Duel.GetMatchingGroup(aux.FaceupFilter(Card.IsLevelBelow,5),tp,0,LOCATION_MZONE,nil)
	Duel.Destroy(sg,REASON_EFFECT)
end