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: 'kids at a skateboard park riding skateboards and watching'. How many words start with the letter 'a' in the sentence.
[A]: 3


[Q]: Sentence: 'old junked blue truck in a field between two dead trees'. How many words start with the letter 't' in the sentence.
[A]: 3


[Q]: Sentence: 'a skateboarder rides his skateboard at the skate park'. How many words start with the letter 's' in the sentence.
[A]:
3