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Given a list and target, the following function should return the index of the last occurrence of the target in the li If target is not in the list the function should return $-1.$

For example:

Given the list $3,4,1,0,1,$ and a target of $1,$ the function should return $4$ as that is the index of the last $1$ the list.

Given the list $3,4,1,1,1,$ and a target of $5,$ the function should return $-1$ as the target $5$ does not exist in the list.

Some parts of the function are missing. Complete the function so that it performs the task correctly.