TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a small white dog looking out a car window'. Find frequency of the letter 'l'

SOLUTION: 3

PROBLEM: Sentence: 'people seated on a table looking very happy'. Find frequency of the letter 'g'

SOLUTION: 1

PROBLEM: Sentence: 'two men sitting on a couch after playing pool'. Find frequency of the letter 'l'

SOLUTION:
2