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: 'two couples sit on a bench in front of bushes with pink flowers'. How many words start with the letter 'o' in the sentence.
[A]: 2


[Q]: Sentence: 'a person on skis goes across a snowy slope'. How many words start with the letter 'a' in the sentence.
[A]: 3


[Q]: Sentence: 'a view of a city street with several double decker buses parked along the side as cars drive by'. How many words start with the letter 'a' in the sentence.
[A]:
4