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 a skateboard jumping in the air'. How many words start with the letter 'a' in the sentence.
[A]: 3


[Q]: Sentence: 'a little boy sitting at a table with a spoon full of food'. How many words start with the letter 's' in the sentence.
[A]: 2


[Q]: Sentence: 'a white and grey cat is walking by a keyboard'. How many words start with the letter 'w' in the sentence.
[A]:
2