TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'two men in black wet suits beside a white surfboard'. Find frequency of the letter 'e'

SOLUTION: 5

PROBLEM: Sentence: 'children with scissors and construction paper in a school classroom'. Find frequency of the letter 'c'

SOLUTION: 6

PROBLEM: Sentence: 'a goose walking on sand with a body of water in the background'. Find frequency of the letter 'a'

SOLUTION:
6