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 toilet of some sort near a sink of some sort'. Find frequency of the letter 'o'
[EX A]: 7

[EX Q]: Sentence: 'a man is talking in front of a television'. Find frequency of the letter 'i'
[EX A]:
5