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

[EX Q]: Sentence: 'a bed with a dog laying on it next to two laptop computers'. Find frequency of the letter 'n'
[EX A]: 3

[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 motorcycle rider dips low as he takes a turn'. Find frequency of the letter 'o'
[EX A]:
3