Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If you control a "Ritual Beast" monster: Destroy monsters on the field up to the number of "Ritual Beast" monsters you currently control.
--霊獣の連契
--Ritual Beast Steeds
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:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
s.listed_series={SET_RITUAL_BEAST}
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsSetCard,SET_RITUAL_BEAST),tp,LOCATION_MZONE,0,1,nil)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(aux.TRUE,tp,LOCATION_MZONE,LOCATION_MZONE,1,nil) end
	local g=Duel.GetMatchingGroup(aux.TRUE,tp,LOCATION_MZONE,LOCATION_MZONE,nil)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,1,0,0)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local ct=Duel.GetMatchingGroupCount(aux.FaceupFilter(Card.IsSetCard,SET_RITUAL_BEAST),tp,LOCATION_MZONE,0,nil)
	if ct==0 then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
	local g=Duel.SelectMatchingCard(tp,aux.TRUE,tp,LOCATION_MZONE,LOCATION_MZONE,1,ct,nil)
	if #g>0 then
		Duel.HintSelection(g)
		Duel.Destroy(g,REASON_EFFECT)
	end
end