Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Discard up to 3 Monster Cards from your hand to the Graveyard.
--陽気な葬儀屋
--The Cheerful Coffin
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_HANDES)
	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.IsMonster,tp,LOCATION_HAND,0,1,nil) end
	Duel.SetOperationInfo(0,CATEGORY_HANDES,nil,0,tp,1)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	Duel.DiscardHand(tp,Card.IsMonster,1,3,REASON_EFFECT|REASON_DISCARD)
end