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 with short, brown hair is looking into a circular mirror and holding a camera up to her cheek'. Find frequency of the letter 'e'

SOLUTION: 4

PROBLEM: Sentence: 'apples, pears, and oranges are piled up for sale'. Find frequency of the letter 'a'

SOLUTION: 6

PROBLEM: Sentence: 'sheep in the process of getting sheered of their wool'. Find frequency of the letter 'o'

SOLUTION:
5