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: 'a little boy that is sitting down with a phone'. How many words start with the letter 'p' in the sentence.
[A]: 1


[Q]: Sentence: 'a pilot looking out a window at a mountain'. How many words start with the letter 'a' in the sentence.
[A]:
4