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 yellow and black train on a track'. Is 'yellow' the longest word in the sentence?
Example Output: Yes

Example Input: Sentence: 'a small girl dressed up in a costume with an umbrella'. Is 'umbrella' the longest word in the sentence?
Example Output: Yes

Example Input: Sentence: 'a dalmatian dog looking at a bird behind a fence'. Is 'dalmatian' the longest word in the sentence?
Example Output:
Yes