TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a white toilet sitting next to a bathroom sink'. Find frequency of the letter 'b'

SOLUTION: 1

PROBLEM: Sentence: 'a man hits a tennis ball with a racket on the court'. Find frequency of the letter 'c'

SOLUTION: 2

PROBLEM: Sentence: 'a group of people sanding around a tv playing a game on the nintendo wii'. Find frequency of the letter 'o'

SOLUTION:
6