What is $\sup_{s \in (y,1)} (y-s)^{m} \cdot \frac{m!}{s^{m+1}}$?

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Is there a clever way to evaluate $$\sup_{s \in (y,1)} (y-s)^{m} \cdot \frac{m!}{s^{m+1}}$$
$ y \in\mathbb{R}, \space\space\space 0< y\leq 1$?

I suspect it is $(y-1)^{m} \cdot m! $, but I'm not sure.