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

[EX Q]: Sentence: 'two people in a snowy place near a wooden fence'. Find frequency of the letter 'n'
[EX A]: 5

[EX Q]: Sentence: 'a sailboat is floating near the rocky shore of a beach'. Find frequency of the letter 'o'
[EX A]: 5

[EX Q]: Sentence: 'a view of mountains and plains as seen from an airplane window'. Find frequency of the letter 's'
[EX A]:
4