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"""

Atbash cipher is mapping the alphabet to it's reverse.

So if we take "a" as it is the first letter, we change it to the last - z.

Example:

Attack at dawn --> Zggzxp zg wzdm

Complexity: O(n)

"""

def atbash(s):

translated = ""

for i in range(len(s)):

n = ord(s[i])

if s[i].isalpha():

if s[i].isupper():

x = n - ord('A')

translated += chr(ord('Z') - x)

if s[i].islower():

x = n - ord('a')

translated += chr(ord('z') - x)

else:

translated += s[i]

return translated