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

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


[Q]: Sentence: 'a piece of meat covered in ketchup next to a hamburger on a green plate'. Find frequency of the letter 'g'
[A]: 2


[Q]: Sentence: 'a person is sitting on the bed with a cat on his lap'. Find frequency of the letter 'a'
[A]:
4