Easy example for commutative ring with prime characteristics that has two different roots for $f=x^p-a$?

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The question given was to find an example of ring with prime characteristics such that its two different roots of $f=X^p-a$ both have multiplicity p. I can only think of $\mathbb{Z}/p\mathbb{Z}$. The main takeaway for this problem is to show that for some cases of the ring with prime characteristics, sum of multiplicities of roots can exceed the degree of f.