Question: Turning a Text into a Matrix of letters

Dear Maple users

How do I turn a text into a Matrix of letters in the most convenient and effective way in Maple? Let's say the text contains N letters and the first n of these should be placed in the first row, the next n letters in the second row and so on. In my first question the text is one continous string of only letters a-z with no spaces or numbers, etc. 

My second question would be how I can do the same as above, if the text contains spaces, numbers and other special symbols, which should be ignored. 

The subject is Cryptography. I hope some can help.


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