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

[Q]: Sentence: 'the skateboarder is jumping over a huge statue of a shoe'. Find frequency of the letter 'i'
[A]: 2


[Q]: Sentence: 'three men are in a kitchen cooking and cutting through a dish'. Find frequency of the letter 'a'
[A]: 4


[Q]: Sentence: 'a stop sign underneath some telephone wiring'. Find frequency of the letter 's'
[A]:
3