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: 'dusty train passing through a dry mountain valley'. How many words start with the letter 'd' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a man with baseball gear on holding a bat in his hands'. How many words start with the letter 'a' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a rice dish with broccoli on one plate and chicken on another'. How many words start with the letter 'o' in the sentence.
[EX A]:
3