In this task, you need to count the number of times the given letter appears in the given sentence.

Q: Sentence: 'a small boat and a large boat on a river near a city'. Find frequency of the letter 'a'

A: 10
****
Q: Sentence: 'a woman fully dressed as a geisha'. Find frequency of the letter 'm'

A: 1
****
Q: Sentence: 'a boy that is sitting at a table with pizza'. Find frequency of the letter 's'

A:
2
****