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 skating down a stair rail in front of a bunch of people'. Find frequency of the letter 'o'

SOLUTION: 5

PROBLEM: Sentence: 'a young man riding a skateboard near a forest'. Find frequency of the letter 'd'

SOLUTION: 2

PROBLEM: Sentence: 'a person placing their hand on the bottom of the bed in a dark room'. Find frequency of the letter 's'

SOLUTION:
1