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 snow filled mountain with a guy with ski's'. Find frequency of the letter 'f'
[EX A]: 1

[EX Q]: Sentence: 'a woman standing on a surfboard riding a wave'. Find frequency of the letter 'w'
[EX A]:
2