TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'an area that has surrounded by a metal fence'. Find frequency of the letter 'o'

SOLUTION: 1

PROBLEM: Sentence: 'a jet flying through the clear blue sky'. Find frequency of the letter 'g'

SOLUTION: 2

PROBLEM: Sentence: 'a woman wearing a head covering talking on a cell phone'. Find frequency of the letter 'e'

SOLUTION:
5