Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
"Elemental HERO Heat" + "Elemental HERO Lady Heat" Must be Fusion Summoned and cannot be Special Summoned by other ways. If this card battles a WATER monster, this card gains 1000 ATK during the Damage Step only.
--E・HERO フレイム・ブラスト
--Elemental HERO Inferno
local s,id=GetID()
function s.initial_effect(c)
	--fusion material
	c:EnableReviveLimit()
	Fusion.AddProcMix(c,true,true,98266377,95362816)
	--spsummon condition
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE+EFFECT_FLAG_UNCOPYABLE)
	e1:SetCode(EFFECT_SPSUMMON_CONDITION)
	e1:SetValue(aux.fuslimit)
	c:RegisterEffect(e1)
	--atkup
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCode(EFFECT_UPDATE_ATTACK)
	e2:SetCondition(s.atkcon)
	e2:SetValue(1000)
	c:RegisterEffect(e2)
end
s.material_setcode={SET_HERO,SET_ELEMENTAL_HERO}
function s.atkcon(e)
	local ph=Duel.GetCurrentPhase()
	if ph~=PHASE_DAMAGE and ph~=PHASE_DAMAGE_CAL then return false end
	local bc=e:GetHandler():GetBattleTarget()
	return bc and bc:IsFaceup() and bc:IsAttribute(ATTRIBUTE_WATER)
end