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

[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 couple is cutting in to a cake at a wedding'. Find frequency of the letter 'd'
[EX A]: 2

[EX Q]: Sentence: 'a large golden clock on a building with carved patterns'. Find frequency of the letter 'i'
[EX A]:
3