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

[Q]: Sentence: 'a bed with a dog laying on it next to two laptop computers'. Find frequency of the letter 'n'
[A]: 3


[Q]: Sentence: 'two people wearing snowboards sitting on a snowy slope'. Find frequency of the letter 's'
[A]: 5


[Q]: Sentence: 'a computer is sitting on a white desk'. Find frequency of the letter 'p'
[A]:
1