import datetime, base64, hashlib
resp = "nothing"
try:
    cur = datetime.datetime.now()
    year = cur.year
    month = cur.month
    day = cur.day
    hour = cur.hour
    xhstr = "xuehai%d&zhitongyun%d$100fen%d@%d" % (year, month, day, hour)
    base64ed = base64.b64encode(xhstr.encode('UTF-8'))
    md5ed = hashlib.md5(base64ed+b'\n').hexdigest()
    if 12 <= hour and hour <= 24:
        resp = md5ed[16:32]
    else:
        resp = md5ed[0:16]
except:
    resp = "error"
print(resp)