TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a blue bowl holding mashed bananas and oatmeal with a bottle of sugar and cinnamon sitting beside it'. Find frequency of the letter 'g'

SOLUTION: 3

PROBLEM: Sentence: 'this yellow fire hydrant sits in a grass field'. Find frequency of the letter 'i'

SOLUTION: 5

PROBLEM: Sentence: 'a cat that is sitting on a suitcase'. Find frequency of the letter 'a'

SOLUTION:
5