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

[Q]: Sentence: 'a person is water skiing and there are birds flying around above them'. Find frequency of the letter 'n'
[A]: 5


[Q]: Sentence: 'two bears swim in a blue pool of water'. Find frequency of the letter 'o'
[A]: 4


[Q]: Sentence: 'a fire hydrant with a hose sticking out of it's side'. Find frequency of the letter 't'
[A]:
5