TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a family out snow skiing on a blustery day'. Find frequency of the letter 'i'

SOLUTION: 3

PROBLEM: Sentence: 'large grassy pasture filled with trees and a single horse'. Find frequency of the letter 'l'

SOLUTION: 4

PROBLEM: Sentence: 'a small bathroom that has a toilet in the floor'. Find frequency of the letter 'a'

SOLUTION:
6