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

[Q]: Sentence: 'a photo of a toilet which is not clean'. Find frequency of the letter 'w'
[A]: 1


[Q]: Sentence: 'a man in costume talking on a cell phone'. Find frequency of the letter 'm'
[A]: 2


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