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: 'a chair and umbrella on a sandy beach'. Find frequency of the letter 's'

SOLUTION: 1

PROBLEM: Sentence: 'a woman in a yellow bikini standing next to a surfboard'. Find frequency of the letter 'm'

SOLUTION:
1