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

[EX Q]: Sentence: 'a picture of a toilet and toilet paper in a bathroom'. Find frequency of the letter 'o'
[EX A]: 5

[EX Q]: Sentence: 'a desk covered in notepads, a laptop and other devices'. Find frequency of the letter 'c'
[EX A]: 2

[EX Q]: Sentence: 'a person holding a banana with a message on it'. Find frequency of the letter 's'
[EX A]:
3