TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a glass a rope and a pair of scissors'. Find frequency of the letter 's'

SOLUTION: 6

PROBLEM: Sentence: 'different sets of luggage in a baggage claim area'. Find frequency of the letter 'r'

SOLUTION: 2

PROBLEM: Sentence: 'a large jetliner sitting on top of an airport tarmac'. Find frequency of the letter 't'

SOLUTION:
6