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: 'several people watch cars drive by with bikes on them'. How many words start with the letter 'b' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a silver and blue amtrak train sitting below tall buildings'. How many words start with the letter 'b' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a man skating on the street near a building'. How many words start with the letter 'a' in the sentence.
[EX A]:
2