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 doughnut held in a persons hand'. Find frequency of the letter 'n'

SOLUTION: 4

PROBLEM: Sentence: 'a woman in a tank top reaches out for a frisbee'. Find frequency of the letter 'a'

SOLUTION: 6

PROBLEM: Sentence: 'a vase with flowers, rocks, and water in it'. Find frequency of the letter 'i'

SOLUTION:
3