Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Once per turn, you can discard 1 card from your hand to return Spell/Trap Cards from the field to the hand equal to the number of face-up Tuner monsters on the field.
--A・O・J サイクロン・クリエイター
--Ally of Justice Cyclone Creator
local s,id=GetID()
function s.initial_effect(c)
	--to hand
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_TOHAND)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCountLimit(1)
	e1:SetCost(s.cost)
	e1:SetTarget(s.target)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
end
function s.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsDiscardable,tp,LOCATION_HAND,0,1,nil) end
	Duel.DiscardHand(tp,Card.IsDiscardable,1,1,REASON_COST|REASON_DISCARD,nil)
end
function s.cfilter(c)
	return c:IsFaceup() and c:IsType(TYPE_TUNER)
end
function s.rfilter(c)
	return c:IsSpellTrap() and c:IsAbleToHand()
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	local ct=Duel.GetMatchingGroupCount(s.cfilter,tp,LOCATION_MZONE,LOCATION_MZONE,nil)
	if chk==0 then return Duel.IsExistingMatchingCard(s.rfilter,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,ct,nil) end
	local rg=Duel.GetMatchingGroup(s.rfilter,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,nil)
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,rg,ct,0,0)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp,chk)
	local ct=Duel.GetMatchingGroupCount(s.cfilter,tp,LOCATION_MZONE,LOCATION_MZONE,nil)
	local rg=Duel.GetMatchingGroup(s.rfilter,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,nil)
	if #rg<ct then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_RTOHAND)
	local sg=rg:Select(tp,ct,ct,nil)
	Duel.HintSelection(sg)
	Duel.SendtoHand(sg,nil,REASON_EFFECT)
end