TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a man on a skateboard going down a ramp while people are watching'. Find frequency of the letter 'w'

SOLUTION: 3

PROBLEM: Sentence: 'there is a person standing on a blue towel'. Find frequency of the letter 'n'

SOLUTION: 4

PROBLEM: Sentence: 'a no stopping and a no parking sign on a pole with a brooklyn street sign in the background'. Find frequency of the letter 'i'

SOLUTION:
6