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simona1@sfusd.edu palindrome > onlyLetters
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Returns a String that has only the letters of the alphabet in the String argument. You may find Character.isLetter() helpful. For example, Character.isLetter('a') is true and Character.isLetter('2') is false.


onlyLetters("apple!") → "apple"
onlyLetters("#$@%&!") → ""
onlyLetters("") → ""

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public String onlyLetters(String sString){ }

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