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

Q: Sentence: 'a bed with a mattress that has nothing on it'. Find frequency of the letter 'a'

A: 5
****
Q: Sentence: 'a piece of meat covered in ketchup next to a hamburger on a green plate'. Find frequency of the letter 'g'

A: 2
****
Q: Sentence: 'a man riding a mini bike with a board attached to it'. Find frequency of the letter 'o'

A:
2
****