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

[EX Q]: Sentence: 'a close up of a bird on the outside window sill'. Find frequency of the letter 'c'
[EX A]: 1

[EX Q]: Sentence: 'a truck with a camper sits parked in some vegetation'. Find frequency of the letter 's'
[EX A]: 3

[EX Q]: Sentence: 'a person taking a photo of a cat on a car'. Find frequency of the letter 'o'
[EX A]:
5