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 pitcher throwing a baseball during a baseball game'. How many words start with the letter 'b' in the sentence.

A: 2
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Q: Sentence: 'a yellow grey and white bird on a small group of twigs'. How many words start with the letter 'b' in the sentence.

A: 1
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Q: Sentence: 'a cute dog equipped with life jacket stands on a surfboard'. How many words start with the letter 'a' in the sentence.

A:
2
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