TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'the street sign is next to a curved road'. Find frequency of the letter 's'

SOLUTION: 3

PROBLEM: Sentence: 'this marketplace has a lot of fresh fruit and vegetables'. Find frequency of the letter 'v'

SOLUTION: 1

PROBLEM: Sentence: 'a small little toilet that is in a corner'. Find frequency of the letter 'a'

SOLUTION:
4