Can you apply a Caesar cipher with right shift of 4 to "MY HIDDEN SECRET"?
Shift the alphabet by four places to the right, and substitute each letter with its corresponding number in the following table:

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

   0 1 2 3 4 5 6 7 8 9 
  - - - - - - - - - - - -
  1 0 2 3 4 5 6 7 8 9 
   - - - - - - - - - - -
    0 1 2 3 4 5 6 7 8 
     - - - - - - - - - 
      9 8 7 6 5 4 3 2 1 
       - - - - - - - - 
        8 7 6 5 4 3 
         - - - - - - 
          2 1 0 9 8 7 
           - - - - - 

 Shifted letters are shown below in bold. To decrypt the message, simply reverse the process. For example, if the message was encoded using the Caesar cipher with right shift of 4, then it can be decoded as follows:
```py 
my_hidden_secret = 'MNOQRSUTWVXZ'
shifted = ['M', 'N', 'O', 'P'] # list of shifted characters
decrypted_message = ''
for char in shifted:
   char_value = ord(char) + 4
   decrypted_message += chr(character_value)
print(decrypted_message)
# Output: HELLOWORLD!!!!!!!!!