TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a tennis player that is running to get the tennis ball'. Find frequency of the letter 't'

SOLUTION: 7

PROBLEM: Sentence: 'apples, pears, and oranges are piled up for sale'. Find frequency of the letter 'a'

SOLUTION: 6

PROBLEM: Sentence: 'a person is skiing over a snowy hill'. Find frequency of the letter 'w'

SOLUTION:
1