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 cat standing on a suitcase and checking out peoples bags'. How many words start with the letter 's' in the sentence.
[A]: 2


[Q]: Sentence: 'a man pulls a rolling suitcase and is wearing a suit'. How many words start with the letter 'a' in the sentence.
[A]: 4


[Q]: Sentence: 'a man skating on a green skate board at a skate park'. How many words start with the letter 's' in the sentence.
[A]:
3