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


The user must be able to choose &nbsp; '''J''' &nbsp;=&nbsp; '''I'''  &nbsp; &nbsp; or &nbsp; no &nbsp; '''Q''' &nbsp; 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>

