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

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

Sentence: 'an image of a cautionary construction sign'. Find frequency of the letter 'a'
5

Sentence: 'wooden and black bench on the side of the road'. Find frequency of the letter 'a'

3