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 and a woman are walking down the street with an umbrella over their heads'. Find frequency of the letter 'w'

SOLUTION: 4

PROBLEM: Sentence: 'some food on plates next to each other on a table'. Find frequency of the letter 'e'

SOLUTION: 6

PROBLEM: Sentence: 'a man taking a photo of people seated in a building'. Find frequency of the letter 's'

SOLUTION:
1