TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'this marketplace has a lot of fresh fruit and vegetables'. Find frequency of the letter 'v'

SOLUTION: 1

PROBLEM: Sentence: 'three people are gathered around sitting on a park bench'. Find frequency of the letter 'g'

SOLUTION: 2

PROBLEM: Sentence: 'a big airplane that is on a runway'. Find frequency of the letter 'h'

SOLUTION:
1