TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a photo of a toilet which is not clean'. Find frequency of the letter 'w'

SOLUTION: 1

PROBLEM: Sentence: 'there is a woman pointing at something with her dog'. Find frequency of the letter 'i'

SOLUTION: 5

PROBLEM: Sentence: 'a red passenger tram is near a platform on rail road tracks'. Find frequency of the letter 'r'

SOLUTION:
8