In this task, you need to count the number of words in a sentence that start with the given letter. Answer with numbers and not words.

[Q]: Sentence: 'a person walking on a city street with a luggage bag'. How many words start with the letter 'w' in the sentence.
[A]: 2


[Q]: Sentence: 'a giraffe and two small hogs stand in an enclosure'. How many words start with the letter 's' in the sentence.
[A]: 2


[Q]: Sentence: 'a man walks down a city street with a dog in his backpack'. How many words start with the letter 'a' in the sentence.
[A]:
3