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

[Q]: Sentence: 'a bunch of broken down trains sit in a yard'. Find frequency of the letter 'n'
[A]: 5


[Q]: Sentence: 'bananas are being dried in a tropical setting'. Find frequency of the letter 'i'
[A]: 5


[Q]: Sentence: 'a tower with some bright lights and clocks on it'. Find frequency of the letter 'h'
[A]:
3