TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a double-decker bus covered in children's illustrations driving next to a van'. Find frequency of the letter 'a'

SOLUTION: 4

PROBLEM: Sentence: 'a group of people standing around a table filled with assorted electronic devices'. Find frequency of the letter 'w'

SOLUTION: 1

PROBLEM: Sentence: 'a player swings his bat at a baseball game'. Find frequency of the letter 'p'

SOLUTION:
1