what was patient 86929's last ward identification when they came to the hospital last time?
select transfers.wardid from transfers where transfers.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 86929 and admissions.dischtime is not null order by admissions.admittime desc limit 1 ) and transfers.wardid is not null order by transfers.intime desc limit 1