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

[Q]: Sentence: 'a guy surfs a wave with his surfboard'. Find frequency of the letter 's'
[A]: 4


[Q]: Sentence: 'a laptop computer with pictures of giraffes on the homescreen'. Find frequency of the letter 'o'
[A]: 5


[Q]: Sentence: 'a view of a bunch of plate sitting on a table, with a man setting utensils. 
'. Find frequency of the letter 'p'
[A]:
1