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

[EX 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'
[EX A]: 2

[EX Q]: Sentence: 'a surfer wipes out on a huge wave'. Find frequency of the letter 'a'
[EX A]: 3

[EX Q]: Sentence: 'three people walking inside a gate, one of them has skis and poles in her hand'. Find frequency of the letter 'n'
[EX A]:
6