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: 'horses are being walked around a race track'. How many words start with the letter 't' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'a mirror a sink a toilet  and a blue basket'. How many words start with the letter 'a' in the sentence.
[EX A]: 5

[EX Q]: Sentence: 'a man is going down a slope on a snowboard'. How many words start with the letter 'a' in the sentence.
[EX A]:
3