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: 'a group of four people are riding a ski lift as they ride over the snowy mountain'. How many words start with the letter 'a' in the sentence.
[A]: 4


[Q]: Sentence: 'a man standing over a sheet cake on top of a table'. How many words start with the letter 's' in the sentence.
[A]: 2


[Q]: Sentence: 'a public bus pulled up next to a truck in front of a church'. How many words start with the letter 'a' in the sentence.
[A]:
3