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

[EX Q]: Sentence: 'a long row of tables displaying lots of fruit'. Find frequency of the letter 'o'
[EX A]: 5

[EX Q]: Sentence: 'a couple of buses parked on the side of the street'. Find frequency of the letter 'b'
[EX A]: 1

[EX Q]: Sentence: 'a laptop computer sitting on top of a desk'. Find frequency of the letter 'g'
[EX A]:
1