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 boy standing on sand and flying a green kite'. How many words start with the letter 'f' in the sentence.
[A]: 1


[Q]: Sentence: 'a car sitting on a train carriage on the tracks'. How many words start with the letter 'a' in the sentence.
[A]: 2


[Q]: Sentence: 'a laptop sits atop a cardboard stand on a desk'. How many words start with the letter 'a' in the sentence.
[A]:
4