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

Sentence: 'a couple of men standing inside of a liquor store'. Find frequency of the letter 'p'
1

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

Sentence: 'sheep looking around and grazing in their enclosure'. Find frequency of the letter 'd'

2