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.

[Q]: Sentence: 'a pitcher throwing a baseball during a baseball game'. How many words start with the letter 'b' in the sentence.
[A]: 2


[Q]: Sentence: 'a colorful sculpture of an elephant in a park'. How many words start with the letter 'a' in the sentence.
[A]: 3


[Q]: Sentence: 'the people on the side of the street are using umbrellas'. How many words start with the letter 'o' in the sentence.
[A]:
2