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

[EX Q]: Sentence: 'a man holding a brown paper bag kite'. Find frequency of the letter 'b'
[EX A]: 2

[EX Q]: Sentence: 'people fishing and enlarge mountainlake with trees lining the shoreline'. Find frequency of the letter 't'
[EX A]: 4

[EX Q]: Sentence: 'you can see the young girl in the bathroom mirror'. Find frequency of the letter 'e'
[EX A]:
4