TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a man in a black shirt prepares to catch a frisbee'. Find frequency of the letter 'f'

SOLUTION: 1

PROBLEM: Sentence: 'group of snowboarders on a snowy trail overlooking a mountain'. Find frequency of the letter 'r'

SOLUTION: 5

PROBLEM: Sentence: 'a portion of a frosted cake left of a table'. Find frequency of the letter 'e'

SOLUTION:
4