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 man standing over a sheet cake on top of a table'. How many words start with the letter 's' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a man is sitting on his motorcycle outside'. How many words start with the letter 'o' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a couple of children play a game of frisbe'. How many words start with the letter 'o' in the sentence.
[EX A]:
2