Advent Of Code Day 4: Security Through Obscurity
import re
import string
code = "aaaaa-bbb-z-y-x-123[abxyz]"
sep = '['
noCheckSum = code.split(sep, 1)[0]
checkSum = re.sub(r'\W+', '', code[code.index("["):])
alphabets = string.ascii_lowercase
checkSumCode = ""
for x in range (0, len (alphabets)):
c = noCheckSum.count(alphabets[x])
if (c > 0):
checkSumCode = checkSumCode + alphabets[x]
checkSumCode = ''.join(sorted(checkSumCode))
if (checkSumCode == checkSum):
print ("Real Room.")
else:
print ("Not a real room.")
Also See
Find common values between 3 arrays. 
Find all such numbers between 1000 and 3000 (both included) such that each digit of the number is an even number. 
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