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 man on a cell phone next to a woman'. How many words start with the letter 'n' in the sentence.
[A]: 1


[Q]: Sentence: 'a couple of giraffes that are walking around'. How many words start with the letter 'c' in the sentence.
[A]: 1


[Q]: Sentence: 'a surprised looking black cat by a bookcase'. How many words start with the letter 'b' in the sentence.
[A]:
3