TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a couple of men standing inside of a liquor store'. Find frequency of the letter 'p'

SOLUTION: 1

PROBLEM: Sentence: 'a man holding a baseball bat an playing baseball'. Find frequency of the letter 'l'

SOLUTION: 6

PROBLEM: Sentence: 'a man holding a hot dog on a bun standing in a forest'. Find frequency of the letter 'i'

SOLUTION:
3