24 с системами счисления

from string import printable
#print(printable)
s = open('24.txt').readline()
S = s
for c in 'FGHIJKLMNOPQRSTUVWXYZ':
    s = s.replace(c, '!')
s = s.split('!')
a = []
for e in s:
    if '8' not in e:
        continue
    l = e.index('8')
    r = max(e.rfind('8'), e.rfind('0'))
    a.append(e[l:r+1])
answ = '0'
for e in a:
    if int(e, 16) > int(answ, 16):
        answ = e
print(answ)
print(S.find(answ))