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 person kneeling down under a green umbrella'. How many words start with the letter 'a' in the sentence.

A: 2
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Q: Sentence: 'a couple of giraffes that are walking around'. How many words start with the letter 'c' in the sentence.

A: 1
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Q: Sentence: 'several boxes of glazed donuts on a desk'. How many words start with the letter 'o' in the sentence.

A:
2
****