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 group of people standing around an airplane on top of a field'. How many words start with the letter 'a' in the sentence.
[EX A]: 5

[EX Q]: Sentence: 'a bathroom sink with two large sinks under a mirror'. How many words start with the letter 's' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a shirtless man is reading a paper on a park bench'. How many words start with the letter 'a' in the sentence.
[EX A]:
3