Question: Write an Bash Shell script to prompt the user for just a series of letters (either uppercase or lowercase). If the user does NOT enter

Write an Bash Shell script to prompt the user for just a series of letters (either uppercase or lowercase). If the user does NOT enter a series of uppercase or lowercase letter, then indicate it is INVALID and prompt the user to allow to enter a VALID series of letters. Once the user enters a valid series of letters, then the script displays that series of letters.

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