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

[Q]: Sentence: 'two giraffes, one standing and one laying down'. Find frequency of the letter 'g'
[A]: 3

[Q]: Sentence: 'a giraffe shares a habitat with a zebra, an ostrich, and an okapi'. Find frequency of the letter 'e'
[A]: 3

[Q]: Sentence: 'a giraffe eating a bunch of green leaves'. Find frequency of the letter 'a'
[A]:
5