;Task:
Implement a [[wp: Playfair cipher| Playfair cipher]] for encryption and decryption.


The user must be able to choose   '''J'''  =  '''I'''      or   no   '''Q'''   in the alphabet.

The output of the encrypted and decrypted message must be in capitalized digraphs, separated by spaces.


;Output example:
                 HI DE TH EG OL DI NT HE TR EX ES TU MP
<br><br>