Well a hint i guess one can call it would be is to use characters. Notice for ascII in decimal '1' is 49, '2' is 50 and so on. That also goes for the letters 'A' is 65 and 'B' is 66. A for loop can increment up or down, so its a matter of number++; or number--;
Hope this helps,
Mike.
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Hope this helps,
Mike.