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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There is no English word that contains all 26 letters of the Alphabet.
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The official Hawaiian alphabet contains 13 letters rather than 12. No, I'm unable to find a Hawaiian word which utilizes the entire alphabet.
You can find alphabet sounds at local teaching store. You can also ask at your local elementary school kindergarten or pre-school. You can also download the sounds online at various webpages.
Information on letters in the Greek alphabet is available online. For example, the Explore Crete website and the Scenta website both have information.