TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a few giraffes standing in a field looking around'. Find frequency of the letter 'e'

SOLUTION: 3

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

SOLUTION: 3

PROBLEM: Sentence: 'a group of chefs in a kitchen preparing food'. Find frequency of the letter 'i'

SOLUTION:
3