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.

[EX Q]: Sentence: 'a black and white cat sits in a bathroom sink'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a person leans back while holding onto a flying object'. How many words start with the letter 'a' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a person sitting in front of a desk with computers with his feet up on another chair'. How many words start with the letter 'o' in the sentence.
[EX A]:
2