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

[EX Q]: Sentence: 'the interior of a living and dining room'. Find frequency of the letter 'i'
[EX A]: 6

[EX Q]: Sentence: 'a tv in a glass mirror in the bathroom'. Find frequency of the letter 'h'
[EX A]: 2

[EX Q]: Sentence: 'a young girl sitting at a table eating a doughnut'. Find frequency of the letter 'y'
[EX A]:
1