In this task, you are given a premise, a hypothesis, and an update. The premise sentence describes a real-world situation and is always assumed to be true. The hypothesis sentence describes an assumption or inference that you might make about that situation having read the premise. The update provides additional information about the situation that might weaken or strengthen the hypothesis. A weakener is a statement that weakens the hypothesis, that is, it makes you much less likely to believe the hypothesis is true. A strengthener is a statement that strengthens the hypothesis, that is, it makes you much more likely to believe the hypothesis is true. Your task is to answer with 'strengthener' or 'weakener' if the update strengthens or weakens the hypothesis, respectively.

[EX Q]: Premise: A man on a motorcycle is towing a bicyclist on his bicycle behind him.
Hypothesis: A man on a red motorcycle is towing a bicyclist on a blue bicycle.
Update: The bicyclist's black helmet matches the color of his bike.
[EX A]: weakener

[EX Q]: Premise: two guys sitting on the floor, with the guy in the green jacket reading a piece of paper.
Hypothesis: The piece of paper is an eviction notice for the couple.
Update: Both the men look sad.
[EX A]: strengthener

[EX Q]: Premise: A teammate pats a fellow player on the shoulder during a football game.
Hypothesis: A teammate offers encouragement.
Update: The teammate looks motivated.
[EX A]:
strengthener