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: 'zebras and antelopes in a field of dried grass'. How many words start with the letter 'a' in the sentence.
[A]: 3


[Q]: Sentence: 'a green fire hydrant is in the middle of an open dirt hole in a construction area'. How many words start with the letter 'a' in the sentence.
[A]: 4


[Q]: Sentence: 'several sailboats in the water docked at a marina'. How many words start with the letter 'a' in the sentence.
[A]:
2