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

Q: Sentence: 'some sheep are standing in a grassy field'. Find frequency of the letter 'n'

A: 3
****
Q: Sentence: 'a black animal in dirt area below trees and rocks'. Find frequency of the letter 'n'

A: 3
****
Q: Sentence: 'several birds are walking in a line through some water'. Find frequency of the letter 's'

A:
3
****