TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a picture of a toilet and toilet paper in a bathroom'. Find frequency of the letter 'o'

SOLUTION: 5

PROBLEM: Sentence: 'an elephant with broken tusks stands in front of a hill and boulders'. Find frequency of the letter 'n'

SOLUTION: 7

PROBLEM: Sentence: 'surfer riding wave to shore with another person holding onto board'. Find frequency of the letter 'o'

SOLUTION:
8