In this task, you need to answer 'Yes' if the given word is the longest word (in terms of number of letters) in the given sentence, else answer 'No'. Note that there could be multiple longest words in a sentence as they can have the same length that is the largest across all words in that sentence.

Example Input: Sentence: 'a man on skis at the top of a mountain'. Is 'mountain' the longest word in the sentence?
Example Output: Yes

Example Input: Sentence: 'a fire hydrant is across from a large arch'. Is 'hydrant' the longest word in the sentence?
Example Output: Yes

Example Input: Sentence: 'a girl in pajamas stands underneath her purple sheets'. Is 'girl' the longest word in the sentence?
Example Output:
No