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 boy wearing blue has a skateboard in the air near a black railing'. How many words start with the letter 'a' in the sentence.

A: 4
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Q: Sentence: 'there is a lap top on a desk at a office'. How many words start with the letter 'o' in the sentence.

A: 2
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Q: Sentence: 'three zebras walking in a grassy area with a tree in the foreground'. How many words start with the letter 't' in the sentence.

A:
3
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