TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'group of cars on the road with the sun setting behind it'. Find frequency of the letter 'd'

SOLUTION: 2

PROBLEM: Sentence: 'a green bus driving in a street filled with heavy traffic'. Find frequency of the letter 'v'

SOLUTION: 2

PROBLEM: Sentence: 'two boys are doing skateboard jumps in the street'. Find frequency of the letter 's'

SOLUTION:
4