In this task, answer 'Yes' if the frequency of the given word in the two sentences is equal, else answer 'No'.

Example Input: Sentence1: 'a very big travel bus with passengers  waiting on their luggage', Sentence2: 'a teenager riding a skateboard down a street'. Is the frequency of the word 'down' in two sentences equal?
Example Output: No

Example Input: Sentence1: 'a terrier sits on a messy bed in front of the window', Sentence2: 'a football player wearing a uniform on a football field'. Is the frequency of the word 'messy' in two sentences equal?
Example Output: No

Example Input: Sentence1: 'a fire hydrant that is sitting on a sidewalk', Sentence2: 'a red train that is on a rail road track'. Is the frequency of the word 'a' in two sentences equal?
Example Output:
Yes