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

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

[EX Q]: Sentence: 'two people holding their skies in a snowy resort'. Find frequency of the letter 'n'
[EX A]: 3

[EX Q]: Sentence: 'a man putting some cheese on top of his pizza slice'. Find frequency of the letter 'g'
[EX A]:
1