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 fire truck and an ambulance driving down the street'. How many words start with the letter 'a' in the sentence.
[EX A]: 4

[EX Q]: Sentence: 'a man sitting at a cafeteria table with his laptop and looking at his cell phone'. How many words start with the letter 'h' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'book titled fifth avenue 5 am sitting on a bed'. How many words start with the letter 't' in the sentence.
[EX A]:
1