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 plate has ribs broccoli and mashed potatoes on a plate'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'some signs and the roof of a train station'. How many words start with the letter 'a' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a large welcome sign to a town as traffic rides below'. How many words start with the letter 'a' in the sentence.
[EX A]:
3