The input is taken from a negotiation between two participants who take the role of campsite neighbors and negotiate for Food, Water, and Firewood packages, based on their individual preferences and requirements. Given an utterance and recent dialogue context containing past 3 utterances (wherever available), output Yes if the utterance contains the vouch-fair strategy, otherwise output No. vouch-fair is a selfish negotiation strategy. It is used to call out fairness for personal benefit, either when acknowledging a fair deal or when the opponent offers a deal that benefits them. This can be through an explicit call out or can be implied.

Example Input: Context: 'Yes, I think we can. I'm thinking 3 water, 2 food and 1 firewood for myself? How does that sound to you?' 'i can't agree to that, the best i can do is 2water 1 food and 2 firewood for you, i have to have supplies too' 'Could I trade one firewood for another food?'
Utterance: 'no, food is the top priority for me'
Example Output: Yes

Example Input: Context: 'I know we need extra food too and some firewood. Maybe a little water but we shouldn't need too much' 'It sounds like we are looking for the same things. I think there are some extra we can share. Do you have an idea about how it can be the most fair? ' 'how about I'll give you 2 food if you give me 2 firewood and 2 of the water?'
Utterance: 'I think that is a fair deal! '
Example Output: Yes

Example Input: Context: 'No, I don't have any plans for this weekend. Can we camp together?' 'If you want to tag along, sure.  lol  I'll be heading to the mountains so it's going to be hot during the day and cold during the night.' 'Great, hey, I'll make you an offer, I'll keep 3 firewood, 3 food and...'
Utterance: 'Would I be able to take 2 firewood and 3 waters and then you take the res?'
Example Output:
No