We Have Encoded a Message by Assigning the Numbers 1

Short Answer

We have encoded a message by assigning the numbers 1 - 26 to the letters a - z of the alphabet, respectively, and
assigning 27 to a blank space. We have further encoded it by using an encoding matrix. Decode this message by finding
the inverse of the encoding matrix and multiplying it times the coded message.
-The encoding matrix i $$A = \left[ \begin{array} { r r } 3 & - 2 \\- 4 & 3\end{array} \right] \text { and the encoded message is } 45 , - 55,9 , - 3 , - 33,50 , - 39,61 , - 13,24$$