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 male skateboarder in a black shirt doing a trick'. How many words start with the letter 'a' in the sentence.
[A]: 3


[Q]: Sentence: 'an elephant standing in front of some trees with its trunk in the air'. How many words start with the letter 's' in the sentence.
[A]: 2


[Q]: Sentence: 'a pink tub and sink in a white bathroom'. How many words start with the letter 'a' in the sentence.
[A]:
3