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.

[EX Q]: Sentence: 'a close up of a baby with a tooth brush'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'dude in shades sits and eats a hotdog'. How many words start with the letter 's' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a baby and a lady brushing their teeth together'. How many words start with the letter 'b' in the sentence.
[EX A]:
2