count = 0

for x1 in "123456789AB":

for x2 in "0123456789AB":

for x3 in "0123456789AB":

for x4 in "0123456789AB":

for x5 in "0123456789AB":

for x6 in "0123456789AB":

s = x1+x2+x3+x4+x5+x6

if s.count("7") == 1:

if s.count("A") + s.count("B") <=3:

count += 1

print(count)

from itertools import product

count = 0

for s in product("0123456789AB", repeat = 6):

if s.count("7") == 1 and s[0] != "0":

if s.count("A") + s.count("B") <=3:

count += 1

print(count)