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 notebook and pen are left on a park bench'. Find frequency of the letter 'e'
[A]: 5


[Q]: Sentence: 'the plate has a scoop of ice cream between two banana slices'. Find frequency of the letter 'l'
[A]:
2