TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a couple is cutting in to a cake at a wedding'. Find frequency of the letter 'd'

SOLUTION: 2

PROBLEM: Sentence: 'a red train traveling down train tracks near a forest'. Find frequency of the letter 'f'

SOLUTION: 1

PROBLEM: Sentence: 'a cat resting in a cat bed on the couch'. Find frequency of the letter 'c'

SOLUTION:
4