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

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


[Q]: Sentence: 'a microwave oven with a yellow note on the door'. Find frequency of the letter 'w'
[A]: 3


[Q]: Sentence: 'a pizza that is sitting on a wooden platter'. Find frequency of the letter 'z'
[A]:
2