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 group of children that are either sitting or standing in a line, while two are holding a round object.
Hypothesis: the children play a game
Update: the children are on a field trip
Example Output: weakener

Example Input: Premise: A boy wearing a green shirt on a bicycle reflecting off a store window.
Hypothesis: The boy is stopped on his bike.
Update: The boy is talking to the store owner.
Example Output: strengthener

Example Input: Premise: A woman riding a bicycle past a car and a group of people on a sidewalk.
Hypothesis: A woman riding a bicycle near a group of her friends on the sidewalk.
Update: The woman rides the bicycle and waves to the people on the sidewalk who wave back.
Example Output:
strengthener