Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Target 1 "Number" Xyz Monster you control that has no Xyz Materials; attach 2 monsters from your hand to that face-up Xyz Monster, as Xyz Materials.
--ナンバーズ・オーバーレイ・ブースト
--Numbers Overlay Boost
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
s.listed_series={SET_NUMBER}
function s.filter(c)
	return c:IsFaceup() and c:IsType(TYPE_XYZ) and c:IsSetCard(SET_NUMBER) and c:GetOverlayCount()==0
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsControler(tp) and chkc:IsLocation(LOCATION_MZONE) and s.filter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.filter,tp,LOCATION_MZONE,0,1,nil)
		and Duel.IsExistingMatchingCard(Card.IsMonster,tp,LOCATION_HAND,0,2,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TARGET)
	Duel.SelectTarget(tp,s.filter,tp,LOCATION_MZONE,0,1,1,nil)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) and tc:IsFaceup() and not tc:IsImmuneToEffect(e) then
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_XMATERIAL)
		local g=Duel.GetMatchingGroup(Card.IsMonster,tp,LOCATION_HAND,0,nil)
		if #g>=2 then
			local og=g:Select(tp,2,2,nil)
			Duel.Overlay(tc,og)
		end
	end
end