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: 'people walking down the street while some people ride their bicycles'. How many words start with the letter 'w' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'cars and a motorcycle waiting at an intersection'. How many words start with the letter 'a' in the sentence.
[EX A]: 4

[EX Q]: Sentence: 'the snowboarder is enjoying the steep snow hill'. How many words start with the letter 's' in the sentence.
[EX A]:
3