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

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

[EX Q]: Sentence: 'a mixed bouquet of flowers in a glass vase set before a window'. Find frequency of the letter 'w'
[EX A]: 3

[EX Q]: Sentence: 'two giraffes standing in a field with many trees near by'. Find frequency of the letter 'r'
[EX A]:
3