Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Tribute 1 "Blackwing" monster to select 1 face-up Synchro Monster you control. That Synchro Monster gains ATK equal to the Tributed monster's ATK, until the End Phase.
--BF－アンカー
--Blackwing - Bombardment
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_ATKCHANGE)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET+EFFECT_FLAG_DAMAGE_STEP)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetHintTiming(TIMING_DAMAGE_STEP)
	e1:SetCondition(aux.StatChangeDamageStepCondition)
	e1:SetCost(s.cost)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	e1:SetLabel(0)
	c:RegisterEffect(e1)
end
s.listed_series={SET_BLACKWING}
function s.cfilter(c,tp)
	return c:IsSetCard(SET_BLACKWING) and Duel.IsExistingTarget(s.tfilter,tp,LOCATION_MZONE,0,1,c)
end
function s.tfilter(c)
	return c:IsFaceup() and c:IsType(TYPE_SYNCHRO)
end
function s.cost(e,tp,eg,ep,ev,re,r,rp)
	e:SetLabel(1)
	return true
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(tp) and s.tfilter(chkc) end
	if chk==0 then
		if e:GetLabel()~=1 then return false end
		e:SetLabel(0)
		return Duel.CheckReleaseGroupCost(tp,s.cfilter,1,false,nil,nil,tp)
	end
	local rg=Duel.SelectReleaseGroupCost(tp,s.cfilter,1,1,false,nil,nil,tp)
	e:SetLabel(rg:GetFirst():GetAttack())
	Duel.Release(rg,REASON_COST)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
	Duel.SelectTarget(tp,s.tfilter,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:IsFaceup() and tc:IsRelateToEffect(e) then
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(e:GetLabel())
		e1:SetReset(RESETS_STANDARD_PHASE_END)
		tc:RegisterEffect(e1)
	end
end