TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a woman in a messy kitchen with a child'. Find frequency of the letter 'a'

SOLUTION: 4

PROBLEM: Sentence: 'a doorway looking into a small bathroom with white toilet'. Find frequency of the letter 'r'

SOLUTION: 2

PROBLEM: Sentence: 'large pile of blood oranges displayed in photo'. Find frequency of the letter 'o'

SOLUTION:
6