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

[EX Q]: Sentence: 'some food on plates next to each other on a table'. Find frequency of the letter 'e'
[EX A]: 6

[EX Q]: Sentence: 'a cat sleeping near lots of pairs of shoes'. Find frequency of the letter 'r'
[EX A]: 2

[EX Q]: Sentence: 'a man leads a large herd of sheep through town'. Find frequency of the letter 'r'
[EX A]:
3