Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Once per turn, during your Standby Phase: Place 1 Fog Counter on each face-up monster on the field.
--雲魔物のスコール
--Cloudian Squall
local s,id=GetID()
function s.initial_effect(c)
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e1)
	--counter
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_COUNTER)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCode(EVENT_PHASE|PHASE_STANDBY)
	e2:SetCountLimit(1)
	e2:SetCondition(s.condition)
	e2:SetOperation(s.operation)
	c:RegisterEffect(e2)
end
s.counter_place_list={COUNTER_FOG}
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsTurnPlayer(tp)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(Card.IsFaceup,tp,LOCATION_MZONE,LOCATION_MZONE,nil)
	for tc in g:Iter() do
		tc:AddCounter(COUNTER_FOG,1)
	end
end