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 person doing a trick in the water'. How many words start with the letter 'i' in the sentence.
[A]: 1


[Q]: Sentence: 'this is a living room table with several large chairs placed around it'. How many words start with the letter 'a' in the sentence.
[A]: 2


[Q]: Sentence: 'a young man sitting on a park bench looking out at a field'. How many words start with the letter 'a' in the sentence.
[A]:
4