TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a guy riding a bike close to a car in the street'. Find frequency of the letter 'i'

SOLUTION: 4

PROBLEM: Sentence: 'a small dog sits in the rear window of a car'. Find frequency of the letter 'm'

SOLUTION: 1

PROBLEM: Sentence: 'a bird is perched on a container in a person's hand'. Find frequency of the letter 'c'

SOLUTION:
2