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If you want the next letter after a given letter, add one. For the previous letter, subtract one. Depending on the programming language, some additional details may be required - such as converting from text to number before adding, and converting back after adding. You'll also have to decide what to do when you get past the last letter - past the "Z" when going up, or past the "A" when going down.

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Q: Program to find next and previous alphabet of input alphabet?
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