X$622$: Element in Array if Exists

Rewrite the function getElementAt $()$ so that it returns the element $n$th in the array numbers, but only if there is an element at that $p$ exists$).$ If the nth element doesn't exist $($e$.$g$.,$ outside of bounds$),$ then the function should return the third argument notFound.

Examples:

getElementAt $(\{89,90,91\},0,-1)89$

getElementat $(\{89,90,91\},4,-99)-99$

Your $$nswer:

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