I need this in VHDL

You will type the first two digits of your student number (you will also experiment with other digits) using your own keyboard and the Logisim keyboard block. Each digit will be converted to a 7 bit ascii representation by the Logisim keyboard. You should encode the two digits typed in your keyboard as their sum and their difference. You will send the encoded version (sum and diff) of the two digits, simultaneously, through a 14 bit channel. At the other end of the channel you will decode the originals digits of you student number from the arriving sum and difference of such digits. In addition, when experimenting with streams of different digits typed at the keyboard, a blue light should be turned on after two instances, consecutive or not consecutive, where the difference between the digits was 3. The blue light will remain on until another instance of 3, being the difference between the digits, occurs. It will basically count two instances of the difference between digits being 3 and will repeat the count