TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a man in his car eating a donut'. Find frequency of the letter 'm'

SOLUTION: 1

PROBLEM: Sentence: 'a traffic signal by a wire filled with some birds'. Find frequency of the letter 'e'

SOLUTION: 3

PROBLEM: Sentence: 'the skateboarder is jumping over a huge statue of a shoe'. Find frequency of the letter 'i'

SOLUTION:
2