Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Once per turn, during your Main Phase, you can look at 1 face-down card your opponent controls, then return it to its original position.
--パトロイド
--Patroid
local s,id=GetID()
function s.initial_effect(c)
	--confirm
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCountLimit(1)
	e1:SetTarget(s.target)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsControler(1-tp) and chkc:IsOnField() and chkc:IsFacedown() end
	if chk==0 then return Duel.IsExistingTarget(Card.IsFacedown,tp,0,LOCATION_ONFIELD,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEDOWN)
	Duel.SelectTarget(tp,Card.IsFacedown,tp,0,LOCATION_ONFIELD,1,1,nil)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc and tc:IsRelateToEffect(e) and tc:IsFacedown() then
		Duel.ConfirmCards(tp,tc)
	end
end