docstr: Takes an encoded string and attempts to decode it according to the Atbash cipher.
  
  The Atbash cipher is a very simple substitution cipher without a key.
  It operates by replacing every letter in the input by its 'counterpoint'
  in the alphabet. Example: A -> Z, B -> Y, ... , M -> N and vice versa.
code: def decode(self, ctext: T) -> Optional[U]:
      """
      Takes an encoded string and attempts to decode it according to the Atbash cipher.
  
      The Atbash cipher is a very simple substitution cipher without a key.
      It operates by replacing every letter in the input by its 'counterpoint'
      in the alphabet. Example: A -> Z, B -> Y, ... , M -> N and vice versa.
      """
  
      result = ""
      atbash_dict = {
          self.ALPHABET[i]: self.ALPHABET[::-1][i] for i in range(26)
      }
  
      for letter in ctext.lower():
          if letter in atbash_dict.keys():
              # Match every letter of the input to its atbash counterpoint
              result += atbash_dict[letter]
          else:
              # If the current character is not in the defined alphabet,
              # just accept it as-is (useful for numbers, punctuation, etc.)
              result += letter
      return fix_case(result, ctext)
  
file_path: Ciphey/ciphey/basemods/Decoders/atbash.py
imports: from typing import Dict, Optional
  from ciphey.common import fix_case
  from ciphey.iface import Config, Decoder, ParamSpec, T, U, WordList, registry
label_desc: Use image node_id 1 for calling the Atbash obj's underlying member method code with example usage: obj.decode(ctext) and returns: fix_case