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

[EX Q]: Sentence: 'a bedroom with a neatly made bed and a laptop'. Find frequency of the letter 'l'
[EX A]: 2

[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 group of people are around a coffee table'. Find frequency of the letter 'u'
[EX A]:
2