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.

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

Sentence: 'a person riding their mountain bike off road'. How many words start with the letter 'r' in the sentence.
2

Sentence: 'a person takes a picture of a reflection in a mirror in the dark'. How many words start with the letter 'p' in the sentence.

2