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 girl wearing a pink tie and glasses'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a clock tower in front of a dark sky'. How many words start with the letter 'f' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'several white boats are anchored at a marina'. How many words start with the letter 's' in the sentence.
[EX A]:
1