what was the difference between the total amount of output and input of patient 782 on 03/04/2103?
select ( select sum(inputevents_cv.amount) from inputevents_cv where inputevents_cv.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 782 ) ) and strftime('%y-%m-%d',inputevents_cv.charttime) = '2103-03-04' ) - ( select sum(outputevents.value) from outputevents where outputevents.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 782 ) ) and strftime('%y-%m-%d',outputevents.charttime) = '2103-03-04' )