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: 'two adults and a child fly a kite at the beach'. How many words start with the letter 'a' in the sentence.
[A]: 5


[Q]: Sentence: 'a group of young people riding snow boards down a snow covered hillside'. How many words start with the letter 'a' in the sentence.
[A]:
2