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 man stands and holds a brown teddy bear'. How many words start with the letter 't' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'a striped bus travels down a city street at night'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a light aircraft is parked on a green area next to some mountains'. How many words start with the letter 'a' in the sentence.
[EX A]:
4