TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a giraffe sticking it's tongue out near a window'. Find frequency of the letter 'a'

SOLUTION: 4

PROBLEM: Sentence: 'a family out snow skiing on a blustery day'. Find frequency of the letter 'i'

SOLUTION: 3

PROBLEM: Sentence: 'a couple of people get ready to board a plane in the water'. Find frequency of the letter 'l'

SOLUTION:
3