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

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


[Q]: Sentence: 'a row of vintage cars in a grassy field'. Find frequency of the letter 'v'
[A]: 1


[Q]: Sentence: 'a glowing fireplace surrounded by a variety of electric lights'. Find frequency of the letter 'h'
[A]:
1