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

[Q]: Sentence: 'two people holding their skies in a snowy resort'. Find frequency of the letter 'n'
[A]: 3


[Q]: Sentence: 'a knife a cutting board some bananas and a toaster'. Find frequency of the letter 'i'
[A]: 2


[Q]: Sentence: 'man in a black shirt is skating down the railing'. Find frequency of the letter 'n'
[A]:
5