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.

Example Input: 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.
Example Output: strengthener

Example Input: Premise: There are a lot of kids walking on train tracks surrounded by trees.
Hypothesis: THE grass was green
Update: The yellow grass was a result of the drought that had hit the area.
Example Output: weakener

Example Input: Premise: Two men in football uniforms sit on the grass, looking unhappy.
Hypothesis: Two men unhappy after losing a game.
Update: The two men just got injured and are sitting out of the game.
Example Output:
weakener