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: 'a giraffe sticking it's tongue out near a window'. Find frequency of the letter 'a'
[A]: 4


[Q]: Sentence: 'a child sitting a table with a pizza in front of him'. Find frequency of the letter 'h'
[A]:
3