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Learning Opportunities

This puzzle can be solved using the following concepts. Practice using these concepts and improve your skills.

Statement

 Goal

During the galactic war against the Zorglons, the Earth Intelligence Agency intercepted a lot of messages.

It is your task to decode them.

You know that :
1/ The messages are always in capital letter. Words are separated with white spaces. You don't have to decode these spaces.
2/ They are coded with a caesar cypher.
3/ The Zorglons always include the word "CHIEF" in them to be sure there are true messages. Be careful, this must be a separated word : a message such as "HANDKERCHIEF" is not a true message.

Note that the caesar cipher is a shift in the alphabet : for example, with a right shift of 3, A becomes D, B becomes E ... and Z becomes C (cf. https://en.wikipedia.org/wiki/Caesar_cipher).

Given a message, you must decode it (i.e. find the correct shift and output the text containing the word "CHIEF") or output "WRONG MESSAGE" if it is not a true message.
Input
Ligne 1 One string to decode
Output
Ligne 1 One decoded string or "WRONG MESSAGE"
Constraints
Example
Input
HELLO
Output
WRONG MESSAGE

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