import itertools

alphabet = "ABCDX"

ar = itertools.product(alphabet, repeat=4) #Раз­ме­ще­ние с по­вто­ре­ни­ем

arl = []

for i in ar:

arl.append(list(i))

count = 0

for e in arl:

if (e[0] == 'X' or e[0] != 'X') and e[1] != 'X' and e[2] != 'X' and e[3] != 'X':

count += 1

print(count)

from itertools import *

cnt = 0

for i in product('ABCDX', repeat=4):

p = ''.join(i)

if p.count('X') < 2 and p[0] == 'X' or p.count('X') == 0:

cnt +=1

print(cnt)