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

[Q]: Sentence: 'a couple of men sitting next to each other under an umbrella'. Find frequency of the letter 'n'
[A]: 5


[Q]: Sentence: 'this marketplace has a lot of fresh fruit and vegetables'. Find frequency of the letter 'v'
[A]: 1


[Q]: Sentence: 'a person talking an a cell phone while drinking a cup of tea'. Find frequency of the letter 'l'
[A]:
4