Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Look at your opponent's hand. Select and discard 1 Spirit monster to the Graveyard if Spirit monsters exist in his/her hand.
--封神鏡
--Fengsheng Mirror
local s,id=GetID()
function s.initial_effect(c)
	--Discard 1 spirit monster from the opponent's hand
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_HANDES)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
s.listed_card_types={TYPE_SPIRIT}
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetTargetPlayer(tp)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local p=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER)
	local g=Duel.GetFieldGroup(p,0,LOCATION_HAND)
	if #g>0 then
		Duel.ConfirmCards(p,g)
		local tg=g:Filter(Card.IsType,nil,TYPE_SPIRIT)
		if #tg>0 then
			Duel.Hint(HINT_SELECTMSG,p,HINTMSG_TOGRAVE)
			local sg=tg:Select(p,1,1,nil)
			Duel.SendtoGrave(sg,REASON_DISCARD|REASON_EFFECT)
		end
		Duel.ShuffleHand(1-p)
	end
end