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The problem:You and your friend want to encrypt your messages and you have shared a secret key that is known to just the two of you. Every character in the character_set is mapped to some other character in the secret key. For example 'a' is mapped to 'D', 'b' is mapped to 'd', 'c' is mapped to '1' and so forth as shown below: character_set = "0123456789 "
secret_key = "Dd18Abz2EqNPWhYTOjBvtVlpXaH6msFUIC gT4o0KZwJeryQx3f9kSinRu5L7cGM"
What I have to do is work on writing a code that decodes the message - sE8MXYtMAhqYXMPADjhEhzMEhMv2AM1PDBB
Can anyone help with this?

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