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

[Q]: Sentence: 'an empty clean kitchen with island, marble countertops , stove and cabinetry'. Find frequency of the letter 'l'
[A]: 3

[Q]: Sentence: 'people seated on a table looking very happy'. Find frequency of the letter 'g'
[A]: 1

[Q]: Sentence: 'a street sign for battery plaza, and a one way street sign'. Find frequency of the letter 's'
[A]:
4