TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'two computers and a laptop set up on a desk'. Find frequency of the letter 'r'

SOLUTION: 1

PROBLEM: Sentence: 'a boy catching a frisbee while standing ins bunch of leaves'. Find frequency of the letter 'a'

SOLUTION: 5

PROBLEM: Sentence: 'a person on a sidewalk jumping with an umbrella'. Find frequency of the letter 'a'

SOLUTION:
5