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.

Premise: Two girls are standing behind another girl.
Hypothesis: Two girls are preparing to push a third girl.
Update: the third girl is on the top stair
weakener

Premise: A skydiver in a yellow parachute prepares for landing.
Hypothesis: A skydiver is sweating from nerves.
Update: The skydiver's face and hair are wet.
strengthener

Premise: A woman is jogging in grass next to a road.
Hypothesis: Woman jogging in a marathon.
Update: The road is filled with runners hoping to set the new record.

strengthener