Classify given movie review into two categories: positive, or negative based on its content.

Input: Consider Input: all these developments and challenges facing santa weigh down the plot so heavily that they drain all the film of its energy and needlessly strain credibility .

Output: negative

Input: Consider Input: a screenplay more ingeniously constructed than " memento "

Output: positive

Input: Consider Input: at 78 minutes it just zings along with vibrance and warmth .
Output: positive