TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a doorway looking into a small bathroom with white toilet'. Find frequency of the letter 'r'

SOLUTION: 2

PROBLEM: Sentence: 'party cakes in plastic containers, with a cake with a plastic santa claus and reindeer on top'. Find frequency of the letter 's'

SOLUTION: 6

PROBLEM: Sentence: 'fathers and children playing sports in a back yard'. Find frequency of the letter 'c'

SOLUTION:
2