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 young man wearing glasses with a tooth brush in his mouth'. How many words start with the letter 'b' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'many sheep gather on a truck and in a field eating hay'. How many words start with the letter 'h' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'three people in suits are standing and holding surfboards'. How many words start with the letter 's' in the sentence.
[EX A]:
3