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

[Q]: Sentence: 'people plating cake in an office meeting room'. Find frequency of the letter 'g'
[A]: 2


[Q]: Sentence: 'a jet that is flying in the sky with a banner behind it'. Find frequency of the letter 'r'
[A]: 1


[Q]: Sentence: 'a giraffes neck and head near a bunch of branches'. Find frequency of the letter 'c'
[A]:
3