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Write an API that takes a string of records, each a two-character length followed by a message of that length, and prints the concatenated messages.

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The input is guaranteed valid. For example, PrintMessage('02bc101234567890') prints 'bc1234567890'. Follow-up: the input may arrive split across several calls, so PrintMessage('02bc1012345') followed by PrintMessage('67890') must still print 'bc1234567890'.

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