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 computer with a farm on the screen on top of a desk'. How many words start with the letter 'o' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a man using a laptop computer on a table'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'there are a lot of vases on display in a case'. How many words start with the letter 'a' in the sentence.
[EX A]:
3