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

[Q]: Sentence: 'a toilet filled with a brown liner and dirty water'. Find frequency of the letter 't'
[A]: 5


[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: 'baseball player reaching back as he's about to throw the ball'. Find frequency of the letter 'e'
[A]:
5