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

Q: Sentence: 'large grassy pasture filled with trees and a single horse'. Find frequency of the letter 'l'

A: 4
****
Q: Sentence: 'a dog laying on the back of a boat in the water'. Find frequency of the letter 't'

A: 4
****
Q: Sentence: 'a dog is sitting outside of an ornate door'. Find frequency of the letter 'a'

A:
3
****