Задание №86681 ЕГЭ Информатике

import itertools
alphabet = "ПОЛИНА"
vol = "ОИА"
con = "ПЛН"
ar = itertools.product(alphabet, repeat=4)
arl = []
for i in ar:
    arl.append(list(i))
count = 0
for e in arl:
    flag = True
    for i in range(len(e) - 1):
        if (e[i] in vol and e[i + 1] in vol) or (e[i] in con and e[i + 1] in con):
            flag = False
    if flag:
        count += 1
print(count)