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 crowd of people on the street one of which is taking pictures with a cell phone'. How many words start with the letter 'o' in the sentence.
[EX A]: 4

[EX Q]: Sentence: 'a man skateboarding down a rail next to a building'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a sandy beach sitting next to a ocean filled with waves'. How many words start with the letter 'a' in the sentence.
[EX A]:
2