TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a woman cross country skiing in a competition'. Find frequency of the letter 's'

SOLUTION: 3

PROBLEM: Sentence: 'a teenager witting on a futon couch holding gaming controls in both hands'. Find frequency of the letter 'c'

SOLUTION: 3

PROBLEM: Sentence: 'a plate with asparagus, broccoli, carrots, cauliflower and a sandwich'. Find frequency of the letter 'c'

SOLUTION:
5