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 person doing a trick in the water'. How many words start with the letter 'i' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'kids at a skateboard park riding skateboards and watching'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'several people gathered around an oven with a bright yellow glow'. How many words start with the letter 'a' in the sentence.
[EX A]:
3