TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a plastic container next to a toilet on a wooden box'. Find frequency of the letter 'i'

SOLUTION: 3

PROBLEM: Sentence: 'a jet that is flying in the sky with a banner behind it'. Find frequency of the letter 'r'

SOLUTION: 1

PROBLEM: Sentence: 'a cat lays on top of an open and turned on laptop computer'. Find frequency of the letter 'p'

SOLUTION:
5