TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'apples, pears, and oranges are piled up for sale'. Find frequency of the letter 'a'

SOLUTION: 6

PROBLEM: Sentence: 'a man flying through the air on top of a skateboard'. Find frequency of the letter 'h'

SOLUTION: 3

PROBLEM: Sentence: 'a group of smiling people standing around a table laid out with cakes and candy'. Find frequency of the letter 'i'

SOLUTION:
5