TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'bananas are being dried in a tropical setting'. Find frequency of the letter 'i'

SOLUTION: 5

PROBLEM: Sentence: 'the meal is served and ready to be eaten'. Find frequency of the letter 'e'

SOLUTION: 8

PROBLEM: Sentence: 'three baby elephants drinking water in a zoo environment'. Find frequency of the letter 'n'

SOLUTION:
7