TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'several zebras and a giraffe in an enclosure'. Find frequency of the letter 's'

SOLUTION: 3

PROBLEM: Sentence: 'a surfer wipes out on a huge wave'. Find frequency of the letter 'a'

SOLUTION: 3

PROBLEM: Sentence: 'a group of skateboarders standing next to a sculpture'. Find frequency of the letter 'f'

SOLUTION:
1