Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Target monsters on the field, up to the number of Synchro Monsters with different names you control; return them to the hand. You can only activate 1 "Synchro Forceback" per turn.
--シンクロ・フォースバック
--Synchro Forceback
--scripted by Naim
local s,id=GetID()
function s.initial_effect(c)
	--Return monsters to the hand, up to the number of Synchro Monsters with different names you control
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_TOHAND)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetHintTiming(0,TIMINGS_CHECK_MONSTER_E)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsAbleToHand() end
	local ct=Duel.GetMatchingGroup(aux.FaceupFilter(Card.IsType,TYPE_SYNCHRO),tp,LOCATION_MZONE,0,nil):GetClassCount(Card.GetCode)
	if chk==0 then return ct>0 and Duel.IsExistingTarget(Card.IsAbleToHand,tp,LOCATION_MZONE,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_RTOHAND)
	local g=Duel.SelectTarget(tp,Card.IsAbleToHand,tp,LOCATION_MZONE,LOCATION_MZONE,1,ct,nil)
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,g,#g,0,0)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetTargetCards(e)
	if #g>0 then
		Duel.SendtoHand(g,nil,REASON_EFFECT)
	end
end