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

[Q]: Sentence: 'a toilet of some sort near a sink of some sort'. Find frequency of the letter 'o'
[A]: 7


[Q]: Sentence: 'a street at night with trees and streetlights on'. Find frequency of the letter 't'
[A]: 9


[Q]: Sentence: 'a  woman standing next to a man on a motorcycle in front of a market'. Find frequency of the letter 'l'
[A]:
1