TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a group of people walking down a rain soaked street with umbrellas'. Find frequency of the letter 'w'

SOLUTION: 3

PROBLEM: Sentence: 'a display case filled with lots of different clocks'. Find frequency of the letter 'w'

SOLUTION: 1

PROBLEM: Sentence: 'a woman holding an umbrella designed to shelter a dog from the rain'. Find frequency of the letter 'o'

SOLUTION:
5