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: 'dog playing frisbee on the beach with ocean in background'. How many words start with the letter 'o' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'the colorful fruit is laid out in boxes'. How many words start with the letter 'i' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a person standing on a green field next to a river flying a kite'. How many words start with the letter 'a' in the sentence.
[EX A]:
4