Uniform MLE V

Suppose that $X_1 \mid \theta, \dots, X_n \mid \theta \sim \text{Unif}[a,b]$ IID, where $\theta = (a,b)$ is unknown. If it exists, find the MLE of $\theta, \hat{\theta}_{MLE} = (\hat{a}_{MLE}, \hat{b}_{MLE})$ with the data $\{1,2,3,4,-5\}$ and report $\hat{a}_{MLE}\hat{b}_{MLE}$. If it doesn't exist, report $-1$.

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NOTE: It may be helpful to complete Uniform MLE II before attempting this question.