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 guy a skateboard jumping in the air'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'an ostrich in the foreground with giraffes behind eating from a feeder'. How many words start with the letter 'w' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'clock mounted on a hippo sitting on a base'. How many words start with the letter 'o' in the sentence.
[EX A]:
2