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 who is holding some food near his mouth'. How many words start with the letter 'f' in the sentence.
[A]: 1


[Q]: Sentence: 'a police car driving by a construction truck'. How many words start with the letter 'b' in the sentence.
[A]: 1


[Q]: Sentence: 'a sink with mirror and lights are shown'. How many words start with the letter 'a' in the sentence.
[A]:
3