TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a tall building with antenna stands before a jet flying in the background'. Find frequency of the letter 't'

SOLUTION: 6

PROBLEM: Sentence: 'a group of people having dinner and drinking wine'. Find frequency of the letter 'r'

SOLUTION: 3

PROBLEM: Sentence: 'a cat sitting on top of someones laptop'. Find frequency of the letter 'o'

SOLUTION:
6