TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a train on a train track going through a bunch of trees'. Find frequency of the letter 'u'

SOLUTION: 2

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

SOLUTION: 2

PROBLEM: Sentence: 'a plate full of food with a fork on the side'. Find frequency of the letter 'a'

SOLUTION:
3