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 leans back while holding onto a flying object'. How many words start with the letter 'a' in the sentence.
[A]: 2


[Q]: Sentence: 'a skateboarder performing tricks under the lights at night'. How many words start with the letter 'u' in the sentence.
[A]: 1


[Q]: Sentence: 'an orange truck hauling a van with junk'. How many words start with the letter 'w' in the sentence.
[A]:
1