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

Sentence: 'a boy catching a frisbee while standing ins bunch of leaves'. Find frequency of the letter 'a'
5

Sentence: 'a young woman dressed in green and black operating a remote control'. Find frequency of the letter 'r'
5

Sentence: 'a close up of a plate of food on a table'. Find frequency of the letter 'p'

2