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 brown and white dog standing on a lush green field'. How many words start with the letter 'b' in the sentence.

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

A: 1
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Q: Sentence: 'a boy wearing a wetsuit rides a wave on his surfboard'. How many words start with the letter 'w' in the sentence.

A:
3
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