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

[Q]: Sentence: 'a car accident has slowed traffic as a clean up crew works'. Find frequency of the letter 'f'
[A]: 2


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


[Q]: Sentence: 'woman happy to find the biggest vase in the bunch'. Find frequency of the letter 's'
[A]:
2