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: 'a woman is holding the hand of a boy who is leaning on a fire hydrant'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a park landscape with a hammock by a tree'. How many words start with the letter 't' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'a young skateboarder performing a stunt at a skatepark'. How many words start with the letter 'a' in the sentence.
[EX A]:
4