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

[EX Q]: Sentence: 'many different species of sheep in display at a museum'. Find frequency of the letter 'h'
[EX A]: 1

[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 person riding a surfboard in the middle of a wave'. Find frequency of the letter 'o'
[EX A]:
3