Morse Decoder
Your task is to decrypt the secret message using the Morse code.
The message will consist of words with 3 spaces between them and 1 space between each letter of each word.
If the decrypted text starts with a letter then you'll have to print this letter in uppercase.
Input: The secret message (str).
Output: The decrypted text (str).
Examples:
assert morse_decoder("......You should be an authorized user in order to see the full description and start solving this mission.
