TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'man sitting on the side of a van playing the guitar'. Find frequency of the letter 'm'

SOLUTION: 1

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

SOLUTION: 4

PROBLEM: Sentence: 'a fire hydrant that is painted white stands in front of a pink house'. Find frequency of the letter 's'

SOLUTION:
4