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

[EX Q]: Sentence: 'a person does a trick on a ramp on a snowboard'. Find frequency of the letter 's'
[EX A]: 3

[EX Q]: Sentence: 'a white toilet sitting next to a toilet paper roller'. Find frequency of the letter 'o'
[EX A]: 4

[EX Q]: Sentence: 'one woman holding a video game controller and standing next to another woman'. Find frequency of the letter 't'
[EX A]:
5