TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'black and white photograph of man and woman sitting on a bench'. Find frequency of the letter 'w'

SOLUTION: 2

PROBLEM: Sentence: 'a white police vehicle parked on a paved street'. Find frequency of the letter 'a'

SOLUTION: 4

PROBLEM: Sentence: 'a desk with an electronic device a cell phone and a ipod on it'. Find frequency of the letter 'e'

SOLUTION:
7