# Amazon Online Assessment (OA) - Winning Sequence

Given the lower and upper bound of a range of integers, find the largest "mountain array". A mountain array is defined as in the Peak of mountain array problem, i.e. An array that

• has at least 3 elements
• let's call the element with the largest value the "peak", with index `k`. The array elements monotonically increase from the first element to `A[k]`, and then monotonically decreases from `A[k + 1]` to the last element of the array. Thus creating a "mountain" of numbers.

If more tham one valid mountain arrays can be built from a given range of integers, the largest array is the one with the maximum values starting from the left side. For example, `[6, 7, 6, 5]` is larger than `[5, 6, 7, 5]` because first value is larger in the first array.

Return the largest mountain array satisfying the constraints, or -1 if it's not possible.

## Title

### Script

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``````  >>> a = [1, 2, 3]
>>> a[-1]
3``````