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

[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: 'surfboard being displayed in stor window with clothes behind it'. Find frequency of the letter 't'
[EX A]: 4

[EX Q]: Sentence: 'a dog jumping up into the air to catch a frisbee'. Find frequency of the letter 'i'
[EX A]:
4