TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a cooked pizza on a silver platter with another in the background'. Find frequency of the letter 'e'

SOLUTION: 5

PROBLEM: Sentence: 'a couple is cutting in to a cake at a wedding'. Find frequency of the letter 'd'

SOLUTION: 2

PROBLEM: Sentence: 'a serving plate with sandwich slices arranged around eggs'. Find frequency of the letter 'd'

SOLUTION:
3