what is the three, the most frequent input event in 2102?
select d_items.label from d_items where d_items.itemid in ( select t1.itemid from ( select inputevents_cv.itemid, dense_rank() over ( order by count(*) desc ) as c1 from inputevents_cv where strftime('%y',inputevents_cv.charttime) = '2102' group by inputevents_cv.itemid ) as t1 where t1.c1 <= 3 )