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.

Input: Consider Input: Context: 'We cannot budge at all on food. But are more then happy to give up all the extra fire wood for all the food. ' 'Could you trade one food item for either one firewood or water?' 'How about this- You will get 1 food, 1 water and 3 Firewood. I will get 2 Food and 2 Water with 0 Firewood. '
Utterance: 'Hmm, I think I would prefer your original offer instead.  You can have all the food if I can have all the rest.'

Output: No


Input: Consider Input: Context: 'brother  k ,  bro  2 water and 2 wire wood 1 firewood can you given?' 'I think that that is acceptable to me. I want to make sure we both understand: I get 1 Water, 2 Firewood, 2 Food Packages. You get 2 Waters, 1 Firewood, 1 Food Package. I will have to ration my water, but I think the extra comfort is worth it. Does this work for you? ' 'bro its not profitable ratiobro gave 3 water 1 firewood, remaning you can take'
Utterance: 'Won't you feel hungry? I'll accept that deal if we can exchange one water for one food package. That still leaves you with two waters. I think that's the least I'm willing to accept.'

Output: Yes


Input: Consider Input: Context: 'Okay, maybe wwe can split the food and water somehow. I don't know how.🙂' 'Can i have 2 firewood, 2 food and 1 water' 'That can work. That seems like a good solution to the problem.🙂'
Utterance: 'Ok I hope you are okay with that. Please confirm!'


Output: No