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

Sentence: 'children with scissors and construction paper in a school classroom'. Find frequency of the letter 'c'
6

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

Sentence: 'we are looking at an old photo of a rundown street'. Find frequency of the letter 'o'

7