TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a closet with a fan, luggage and various boxes'. Find frequency of the letter 'a'

SOLUTION: 6

PROBLEM: Sentence: 'a man skating down a stair rail in front of a bunch of people'. Find frequency of the letter 'o'

SOLUTION: 5

PROBLEM: Sentence: 'a young woman reading a book on top of the bed'. Find frequency of the letter 't'

SOLUTION:
2