Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Return all monsters you control to the hand.
--撤収命令
--Sound the Retreat!
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_TOHAND)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsAbleToHand,tp,LOCATION_MZONE,0,1,nil) end
	local sg=Duel.GetMatchingGroup(Card.IsAbleToHand,tp,LOCATION_MZONE,0,nil)
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,sg,#sg,0,0)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local sg=Duel.GetMatchingGroup(Card.IsAbleToHand,tp,LOCATION_MZONE,0,nil)
	Duel.SendtoHand(sg,nil,REASON_EFFECT)
end