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: '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

[EX Q]: Sentence: 'black and white photograph of potted plants and gardening tools'. How many words start with the letter 'a' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a person is flying a kite on a brown field'. How many words start with the letter 'a' in the sentence.
[EX A]:
3