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

[Q]: Sentence: 'a truck with a camper sits parked in some vegetation'. Find frequency of the letter 's'
[A]: 3


[Q]: Sentence: 'the sun goes down over a bike tied to a bench at the beach'. Find frequency of the letter 't'
[A]: 5


[Q]: Sentence: 'a tan and brown bathroom with a sink and a mirror'. Find frequency of the letter 't'
[A]:
3