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

Sentence: 'a plate of food, with broccoli and nuts'. Find frequency of the letter 'b'
1

Sentence: 'a jet that is flying in the sky with a banner behind it'. Find frequency of the letter 'r'
1

Sentence: 'three giraffe standing next to a fence under a lot of trees'. Find frequency of the letter 'e'

9