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 guy preforming a skateboard trick at a skate park'. 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: 'cross country skiers on snow covered course during race'. How many words start with the letter 'c' in the sentence.
[A]:
4