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

Sentence: 'a piece of meat covered in ketchup next to a hamburger on a green plate'. Find frequency of the letter 'g'
2

Sentence: 'a chair and umbrella on a sandy beach'. Find frequency of the letter 's'
1

Sentence: 'two dogs wrestling together on the living room floor'. Find frequency of the letter 'h'
2