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 rusty metal park bench in a park'. How many words start with the letter 'a' in the sentence.

A: 2
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Q: Sentence: 'a man with baseball gear on holding a bat in his hands'. How many words start with the letter 'a' in the sentence.

A: 2
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Q: Sentence: 'an officer sits on a brown horse on a city street'. How many words start with the letter 'o' in the sentence.

A:
3
****