TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a scene at night; a plane alone on a runway with lit-up city buildings on the horizon'. Find frequency of the letter 'w'

SOLUTION: 2

PROBLEM: Sentence: 'a surfer is in the middle of an ocean wave'. Find frequency of the letter 'i'

SOLUTION: 3

PROBLEM: Sentence: 'three stuffed animals one has a key around it's neck and one is wearing a red jacket'. Find frequency of the letter 'e'

SOLUTION:
10