'''simple docstring'''





import itertools
import string
from collections.abc import Generator, Iterable







def 			A__      (	snake_case_ :		Iterable[str]       ,				snake_case_ :		int      ):
 SCREAMING_SNAKE_CASE__:   Any=      iter(snake_case_      )
 while True:
  SCREAMING_SNAKE_CASE__:   Union[str, Any]=      tuple(itertools.islice(snake_case_       ,				snake_case_      )      )
  if not chunk:
   return
  yield chunk







def 			A__      (	snake_case_ :		str      ):
 SCREAMING_SNAKE_CASE__:   Tuple=      """""".join([c.upper() for c in dirty if c in string.ascii_letters]      )
 SCREAMING_SNAKE_CASE__:   Any=      """"""

 if len(snake_case_      ) < 2:
  return dirty

 for i in range(len(snake_case_      ) - 1      ):
  clean += dirty[i]

  if dirty[i] == dirty[i + 1]:
   clean += "X"

 clean += dirty[-1]

 if len(snake_case_      ) & 1:
  clean += "X"

 return clean







def 			A__      (	snake_case_ :		str      ):
 SCREAMING_SNAKE_CASE__:   Optional[Any]=      """ABCDEFGHIKLMNOPQRSTUVWXYZ"""
 # we're using a list instead of a '2d' array because it makes the math
 # for setting up the table and doing the actual encoding/decoding simpler
 SCREAMING_SNAKE_CASE__:   List[Any]=      []

 # copy key chars into the table if they are in `alphabet` ignoring duplicates
 for char in key.upper():
  if char not in table and char in alphabet:
   table.append(snake_case_      )

    # fill the rest of the table in with the remaining alphabet chars
 for char in alphabet:
  if char not in table:
   table.append(snake_case_      )

 return table







def 			A__      (	snake_case_ :		str       ,				snake_case_ :		str      ):
 SCREAMING_SNAKE_CASE__:   Tuple=      generate_table(snake_case_      )
 SCREAMING_SNAKE_CASE__:   int=      prepare_input(snake_case_      )
 SCREAMING_SNAKE_CASE__:   List[str]=      """"""

 # https://en.wikipedia.org/wiki/Playfair_cipher#Description
 for chara, chara in chunker(snake_case_       ,				2      ):
  SCREAMING_SNAKE_CASE__:   Optional[Any]=      divmod(table.index(snake_case_      )       ,				5      )
  SCREAMING_SNAKE_CASE__:   Optional[Any]=      divmod(table.index(snake_case_      )       ,				5      )

  if rowa == rowa:
   ciphertext += table[rowa * 5 + (cola + 1) % 5]
   ciphertext += table[rowa * 5 + (cola + 1) % 5]
  elif cola == cola:
   ciphertext += table[((rowa + 1) % 5) * 5 + cola]
   ciphertext += table[((rowa + 1) % 5) * 5 + cola]
  else:  # rectangle
   ciphertext += table[rowa * 5 + cola]
   ciphertext += table[rowa * 5 + cola]

 return ciphertext







def 			A__      (	snake_case_ :		str       ,				snake_case_ :		str      ):
 SCREAMING_SNAKE_CASE__:   Any=      generate_table(snake_case_      )
 SCREAMING_SNAKE_CASE__:   Any=      """"""

 # https://en.wikipedia.org/wiki/Playfair_cipher#Description
 for chara, chara in chunker(snake_case_       ,				2      ):
  SCREAMING_SNAKE_CASE__:   int=      divmod(table.index(snake_case_      )       ,				5      )
  SCREAMING_SNAKE_CASE__:   Any=      divmod(table.index(snake_case_      )       ,				5      )

  if rowa == rowa:
   plaintext += table[rowa * 5 + (cola - 1) % 5]
   plaintext += table[rowa * 5 + (cola - 1) % 5]
  elif cola == cola:
   plaintext += table[((rowa - 1) % 5) * 5 + cola]
   plaintext += table[((rowa - 1) % 5) * 5 + cola]
  else:  # rectangle
   plaintext += table[rowa * 5 + cola]
   plaintext += table[rowa * 5 + cola]

 return plaintext


import re







def 			A__      (	snake_case_ :		str      ):

 if len(re.findall('''[ATCG]'''       ,				snake_case_      )      ) != len(snake_case_      ):
  raise ValueError('''Invalid Strand'''      )

 return dna.translate(dna.maketrans('''ATCG'''       ,				'''TAGC'''      )      )


if __name__ == "__main__":
      import doctest

      doctest.testmod()

