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

[EX Q]: Sentence: 'a woman with short, brown hair is looking into a circular mirror and holding a camera up to her cheek'. Find frequency of the letter 'e'
[EX A]: 4

[EX Q]: Sentence: 'three men in military suits are sitting on a bench,'. Find frequency of the letter 'a'
[EX A]: 3

[EX Q]: Sentence: 'benches and a table set up for outdoor dinning in front of a restaurant'. Find frequency of the letter 'o'
[EX A]:
6