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 zeppelin flying in the air as a water spouts occurs in a city lake'. How many words start with the letter 'a' in the sentence.

A: 5
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Q: Sentence: 'a blue and white sign attached to a building'. How many words start with the letter 'a' in the sentence.

A: 4
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Q: Sentence: 'a desktop and laptop computer on a desk'. How many words start with the letter 'a' in the sentence.

A:
3
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