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

[Q]: Sentence: 'a family sitting at a table in a restaurant looking at their phones'. Find frequency of the letter 't'
[A]: 8


[Q]: Sentence: 'a man using a video game controller in a room'. Find frequency of the letter 'n'
[A]: 4


[Q]: Sentence: 'a man in tie, black coat and a hat'. Find frequency of the letter 'n'
[A]:
3