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: '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: 'two and a half hotdogs on paper plates are on a counter'. How many words start with the letter 'p' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'an intersection shows  an expanse of empty road and then a car coming out from under a large arch that looks like a giant chinese letter and stands between two buildings that stand at the forefront of am open walled walkway and retail venues'. How many words start with the letter 'o' in the sentence.
[EX A]:
4