what was the last height of patient 27703 in the last month.
select chartevents.valuenum from chartevents where chartevents.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 27703 ) ) and chartevents.itemid in ( select d_items.itemid from d_items where d_items.label = 'admit ht' and d_items.linksto = 'chartevents' ) and datetime(chartevents.charttime,'start of month') = datetime(current_time,'start of month','-1 month') order by chartevents.charttime desc limit 1