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

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

[Q]: Sentence: 'a stop sign next to houses with christmas lights'. Find frequency of the letter 's'
[A]: 7

[Q]: Sentence: 'a pitcher on the mound prepares to throw the base ball'. Find frequency of the letter 'p'
[A]:
3