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

[Q]: Sentence: 'a black cat laying down on a bed'. Find frequency of the letter 'y'
[A]: 1


[Q]: Sentence: 'hotel towels with sunglasses perched and hotel business cards and catalog'. Find frequency of the letter 'o'
[A]: 4


[Q]: Sentence: 'adult consuming sliced pizza while sitting on sidewalk bench'. Find frequency of the letter 'e'
[A]:
4