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 picture of a zebra that is walking in the grass'. How many words start with the letter 'z' in the sentence.
[A]: 1


[Q]: Sentence: 'a couple of people are riding horses in a village'. How many words start with the letter 'a' in the sentence.
[A]: 3


[Q]: Sentence: 'a clock tower sits atop a brick building'. How many words start with the letter 'a' in the sentence.
[A]:
3