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

[Q]: Sentence: 'two people holding their skies in a snowy resort'. Find frequency of the letter 'n'
[A]: 3

[Q]: Sentence: 'a scene at night; a plane alone on a runway with lit-up city buildings on the horizon'. Find frequency of the letter 'w'
[A]: 2

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