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## frontback
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### Instructions
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Write a program that prints the previous letter and the next letter of the alphabet.
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- If the number of arguments is different from 1, print (`'\n'`).
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- If the length of the argument is different from 1, print (`'\n'`)
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- If the argument is not a letter, print (`'\n'`)
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- There are no letters to print before 'a' or after 'z'.
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### Usage
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```console
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$ go run . | cat -e
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$
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$ go run . a | cat -e
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ab$
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$ go run . "B" | cat -e
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ABC$
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$ go run . "z" | cat -e
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yz$
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$ go run . "Hello World!" | cat -e
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$
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$ go run . "1" | cat -e
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$
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```
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