"HELP"what is the CODE in this output?

[Fink]

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

[E] encipher
[D] decipher
[X] Exit

Enter choice: e

Enter message to encrypt: (INPUT USER)

Enter key: (INPUT USER)

The encrypted message: (PROGRAM WILL AUTOMATICALLY ENCRYPT THE MESSAGE INPUT BY THE USER)

Back to main menu?
(Yes/No) YES (return to menu if NO, program exits): (INPUT USER)

Enter choice: (INPUT USER)

Enter message to decrypt: (INPUT USER)

Enter key: (INPUT USER)

The decrypted message is: (PROGRAM WILL AUTOMATICALLY ENCRYPT THE MESSAGE INPUT BY THE USER)

Back to main menu? (y/n): N

[ahcfan]

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Fink wrote:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

[E] encipher
[D] decipher
[X] Exit

Enter choice: e

Enter message to encrypt: (INPUT USER)

Enter key: (INPUT USER)

The encrypted message: (PROGRAM WILL AUTOMATICALLY ENCRYPT THE MESSAGE INPUT BY THE USER)

Back to main menu?
(Yes/No) YES (return to menu if NO, program exits): (INPUT USER)

Enter choice: (INPUT USER)

Enter message to decrypt: (INPUT USER)

Enter key: (INPUT USER)

The decrypted message is: (PROGRAM WILL AUTOMATICALLY ENCRYPT THE MESSAGE INPUT BY THE USER)

Back to main menu? (y/n): N