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

Q: Sentence: 'a street at night with trees and streetlights on'. Find frequency of the letter 't'

A: 9
****
Q: Sentence: 'a man sitting on a motorcycle near two other men'. Find frequency of the letter 'r'

A: 3
****
Q: Sentence: 'a red fire hydrant is sitting outside by a curb'. Find frequency of the letter 'd'

A:
3
****