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 burning wood stove has a tea pot sitting on top of it and is full of wood'. Find frequency of the letter 'a'
[EX A]: 5

[EX Q]: Sentence: 'a man is swinging a baseball bat on the diamond'. Find frequency of the letter 'n'
[EX A]:
5