Question: A short message has been encoded by converting it to an integer by replacing each "a" by 1, each "b" by 2, and so on, and concatenating the integers. The result had six or fewer digits. An unknown number a was added to the message mod 913,647, giving 618,232. Without the knowledge of a, what can you say about the message? With the knowledge of a, what could you say about the message?