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

[Q]: Sentence: 'a full plate of food that includes rice and broccoli and carrots'. Find frequency of the letter 's'
[A]: 2


[Q]: Sentence: 'a small wrinkley dog wearing a bow tie'. Find frequency of the letter 'e'
[A]: 3


[Q]: Sentence: 'a man touching stickers on a white wall'. Find frequency of the letter 'i'
[A]:
3