Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When your opponent activates a monster effect, if you have 3 or more cards in your hand (except during the Damage Step): You can target 1 "Dark World" monster on the field; return it to the hand, and if you do, the activated effect becomes "Your opponent randomly discards 1 card".
--暗黒界の洗脳
--Dark World Brainwashing
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e1)
	--Change opponent's monster effect
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_TOHAND)
	e2:SetType(EFFECT_TYPE_ACTIVATE)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e2:SetCode(EVENT_CHAINING)
	e2:SetCountLimit(1,0,EFFECT_COUNT_CODE_CHAIN)
	e2:SetCondition(s.condition)
	e2:SetTarget(s.target)
	e2:SetOperation(s.operation)
	c:RegisterEffect(e2)
	local e3=e2:Clone()
	e3:SetType(EFFECT_TYPE_QUICK_O)
	e3:SetRange(LOCATION_SZONE)
	c:RegisterEffect(e3)
end
s.listed_series={SET_DARK_WORLD}
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return ep==1-tp and re:IsMonsterEffect() and Duel.GetFieldGroupCount(tp,LOCATION_HAND,0)>=3
end
function s.thfilter(c)
	return c:IsFaceup() and c:IsSetCard(SET_DARK_WORLD) and c:IsAbleToHand()
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and s.thfilter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.thfilter,tp,LOCATION_MZONE,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_RTOHAND)
	local g=Duel.SelectTarget(tp,s.thfilter,tp,LOCATION_MZONE,LOCATION_MZONE,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,g,1,tp,0)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) and Duel.SendtoHand(tc,nil,REASON_EFFECT)>0 and tc:IsLocation(LOCATION_HAND) then
		local g=Group.CreateGroup()
		Duel.ChangeTargetCard(ev,g)
		Duel.ChangeChainOperation(ev,s.repop)
	end
end
function s.repop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_CARD,1-tp,id)
	local g=Duel.GetFieldGroup(tp,0,LOCATION_HAND)
	if #g>0 then
		local sg=g:RandomSelect(1-tp,1)
		Duel.SendtoGrave(sg,REASON_EFFECT|REASON_DISCARD)
	end
end