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: 'an elephant has taken a man's hat in its trunk'. Find frequency of the letter 'p'
[A]: 1


[Q]: Sentence: 'there is a piece of cake an a fork on the plate'. Find frequency of the letter 'k'
[A]:
2