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

[Q]: Sentence: 'a large formal living room with yellow couches and table'. Find frequency of the letter 'v'
[A]: 1

[Q]: Sentence: 'a woman is looking at sheep off in a field'. Find frequency of the letter 'm'
[A]: 1

[Q]: Sentence: 'two horses and a carriage being driven by a man in historical clothing'. Find frequency of the letter 't'
[A]:
3