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

[Q]: Sentence: 'a blue fire hydrant painted on the bottom of it'. Find frequency of the letter 'h'
[A]: 2


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


[Q]: Sentence: 'a little girl sitting at a table in front of a heart cake'. Find frequency of the letter 'g'
[A]:
2