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 large jet liner sitting on top of an airport runway'. How many words start with the letter 'a' in the sentence.
[A]: 3


[Q]: Sentence: 'man playing tennis on dirt court outside in the sun'. How many words start with the letter 'd' in the sentence.
[A]: 1


[Q]: Sentence: 'a baseball player swinging at a ball during a game'. How many words start with the letter 'a' in the sentence.
[A]:
4