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

Sentence: 'a close up of a plate with a whole carrot'. Find frequency of the letter 'w'
2

Sentence: 'large grassy pasture filled with trees and a single horse'. Find frequency of the letter 'l'
4

Sentence: 'a man is standing on a bench on the dock'. Find frequency of the letter 'a'

4