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.

[EX Q]: Sentence: 'some signs buildings trees bushes a green and white sign'. How many words start with the letter 's' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a person on a court with a tennis racket'. How many words start with the letter 'p' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'people walking down the street while some people ride their bicycles'. How many words start with the letter 'w' in the sentence.
[EX A]:
2