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 bathroom with a toilet with a blue seat'. How many words start with the letter 'b' in the sentence.

A: 2
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Q: Sentence: 'a blue brick building with a man leaning on it'. How many words start with the letter 'b' in the sentence.

A: 3
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Q: Sentence: 'a sink in a small bathroom with a bottle of soap on the sink and a towel hanging nearby'. How many words start with the letter 'a' in the sentence.

A:
5
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