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 Input:
Premise: Tree boys are skating while one takes pictures and a girl looks on.
Hypothesis: The boys are in a race.
Update: The boys are competing for the affection of the girl.

Ex Output:
strengthener


Ex 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.

Ex Output:
weakener


Ex Input:
Premise: Toddler in blue shirt and beige khaki shorts and brown shoes, holding a small blue shovel, walking along beach shore with two white seagulls swooping towards him.
Hypothesis: The toddler is going to build a sandcastle.
Update: The toddler is going to build a sandcastle one shovelful of sand at a time.

Ex Output:

strengthener