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

[Q]: Sentence: 'three people are gathered around sitting on a park bench'. Find frequency of the letter 'g'
[A]: 2


[Q]: Sentence: 'three men in military suits are sitting on a bench,'. Find frequency of the letter 'a'
[A]: 3


[Q]: Sentence: 'a bird sitting in the shade near an ornamental building feature'. Find frequency of the letter 'r'
[A]:
4