import itertools

alphabet = "ABCDXY"

s = 'XY'

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] in s and e[1] not in s and e[2] not in s and e[3] not in s:

count += 1

print(count)

import itertools

alphabet = "ABCDXYZ"

s = 'XYZ'

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] in s and e[1] not in s and e[2] not in s and e[3] not in s:

count += 1

print(count)

n = 0

for x in 'XYZ':

for y in 'ABCD':

for z in 'ABCD':

for w in 'ABCD':

s = x + y + z + w

n+=1

print(n)

from itertools import product

counter = 0

for i in product("ABCDXYZ", repeat=4):

if(i[0] in "XYZ") and (i.count("X") + i.count("Y") + i.count("Z") == 1):

counter+=1

print(counter)

from itertools import product

a = 'XYZ'

b = 'ABCD'

s = product(a,b,b,b)

k = 0

for i in s:

k += 1

print(k)