In this task, you need to count the number of times the given letter appears in the given sentence.

[EX Q]: Sentence: 'a social occasion of people are uncovered before the open day'. Find frequency of the letter 'c'
[EX A]: 4

[EX Q]: Sentence: 'a giraffe sticking it's tongue out near a window'. Find frequency of the letter 'a'
[EX A]: 4

[EX Q]: Sentence: 'a run down windows with a broken fence outside'. Find frequency of the letter 'e'
[EX A]:
4