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: A barefoot young boy glances at the camera while swinging in a park.
Hypothesis: Billy loves to swing high while his Dad pushes him.
Update: The boy's face is covered in tears.
Example Output: weakener

Example Input: Premise: A group of people is sitting together at a long table.
Hypothesis: A group of people that are friendly with one another are sitting together at the table.
Update: The group is laughing and people have their arms around each other.
Example Output: strengthener

Example Input: Premise: A little kid stands and looks at the military guard who is guarding a building.
Hypothesis: The children are visiting a castle.
Update: The guard is wearing a historic costume.
Example Output:
strengthener