Solve the riddle:
I can be long, or I can be short.
I can be grown, and I can be bought.
I can be painted, or left bare.
I can be round, or square.
What am I?

Below you will find a hint and the correct answer to the riddle.
Little hint:
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Hint: F*ng*rn**l.
Right answer:
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Answer: Fingernail.