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 train passes over a quiet city park on a bridge'. How many words start with the letter 'a' in the sentence.
[A]: 3


[Q]: Sentence: 'a time laps photo of a city street'. How many words start with the letter 'o' in the sentence.
[A]: 1


[Q]: Sentence: 'several shots of a man in various positions with a tennis racquet'. How many words start with the letter 's' in the sentence.
[A]:
2