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

[EX Q]: Sentence: 'a black animal in dirt area below trees and rocks'. Find frequency of the letter 'n'
[EX A]: 3

[EX Q]: Sentence: 'a bowl of vegetables in a soup like substance next to a spoon'. Find frequency of the letter 'a'
[EX A]: 5

[EX Q]: Sentence: 'a meal in a container consisting of an orange, meatballs, carrots, and peas'. Find frequency of the letter 'n'
[EX A]:
8