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

Sentence: 'a family sitting at a table in a restaurant looking at their phones'. Find frequency of the letter 't'
8

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

Sentence: 'a cat sitting extremely close to a tv'. Find frequency of the letter 't'

6