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

[Q]: Sentence: 'a girl sits on a surfboard and smiles'. Find frequency of the letter 'i'
[A]: 3


[Q]: Sentence: 'a white bathroom sink sitting next to a toilet'. Find frequency of the letter 'i'
[A]: 5


[Q]: Sentence: 'woman standing beside clock with roman numerals on sidewalk'. Find frequency of the letter 'n'
[A]:
6